SOIL INSTRUMENTS LTD

SOIL INSTRUMENTS LTD 

GEOTECHNICAL & STRUCTURAL INSTRUMENTATION

www.soil.co.uk 2 

Contents 

04 

08 

12 

16 

19 

20 

22 

24 

26 

30 

32 

36 

INCLINATION 

DATA ACQUISITION 

EXTENSION 

JOINT/CRACK 

LOAD 

PRESSURE 

READOUTS 

SETTLEMENT 

STRAIN 

TEMPERATURE 

TILT 

WATER

SOIL INSTRUMENTS LTD 

Our Company 

For over 45 years Soil Instruments Ltd has been a world leader in the manufacture 

of geotechnical and structural monitoring instrumentation. Our equipment has been 

used to monitor construction projects such as dams, tunnels, deep excavations, 

roads and railways as well as landslides in nearly every country around the world. 

We have over 40 distributors and agents worldwide giving us entry into many 

diverse projects across the globe. In 2006 ITM-Soil was named as the 6th fastest 

growing technology company in the UK by the ‘Sunday Times-Microsoft Tech Track 

100’, a prestigious annual league table of the UK’s fastest growing 

private companies. 

Our Products 

We strive to continuously develop groundbreaking, innovative products that are 

able to meet the challenge of the demanding environments in which we work. 

These include: 

• MEMS-based digital inclinometer systems 

• vibrating wire and solid state piezometers, pressure and load cells 

• tilt sensors 

• wireless sensor systems 

• automatic data acquisition systems 

• data presentation software 

• GPRS enabled dataloggers and gateways 

In 2007 Soil Instruments launched its new Wireless Network Module, capable of 

reading any of our sensors. Data can be stored at each sensor point and transmitted 

across a robust self healing, adaptive wireless mesh network for logging, off -site 

communication and analysis. 

Our Service 

Fundamental to our business strategy is the building of long-term partnerships with 

our customers, distributors, suppliers and employees. This requires the adoption of 

a customer-focused, quality-driven service. 

As part of the ITM-Soil Group, which includes Instrumentation, Testing & Monitoring 

(ITM) Ltd, the UK’s leading instrumentation contractor, we are the largest 

instrumentation and monitoring business in the UK civil engineering market. 

The combination of the cutting edge technology of Soil Instruments and the vast 

experience of ITM forms a company committed to providing quality products and 

service to our customers. To this end, we have BS EN ISO 9001:2000 registration and 

the CE mark on our products confi rms we conform to all relevant EN standards for 

EMC compatibility. 

www.soil.co.uk 

3


4 

INCLINATION

C9. EC 

(Easy Connect) 

Inclinometer Casing 

Applications 

For use in conjunction with traversing or 

in-place inclinometer probes. The casing 

is made of ABS plastic, is simple and 

quick to put together and install. Other 

features include: 

• Extruded grooves to perfectly 

fi t the shape of the inclinometer 

probe wheels 

• Self aligning keyways 

• O-ring seals prevent water or 

grout intrusion 

• Telescoping sections available 

• A spline the length of the casing 

allows it to be cut and recoupled at 

any point with true groove alignment 

• Spiralling control to less than 0.5° 

per length 

Performance 

• The ABS material is suitable for long 

term contact with all types of soils, 

grouts and ground water 

• Maintains its shape and fl exibility over 

a wider range of temperatures than 

PVC plastic 

Specifi cations 

• Material: ABS (Acrylonitrile 

Butadiene Styrene) 

• Groove Spiral: < 0.5° / 3m 

• Collapse Rating: 1960kPa 

• Bend Rating: 252N 

• Maximum Temperature: 80°C 

• Tensile Strength: 585kgF 

• Torque: 25Nm 

Dimensions 

• Eff ective Length: 3m 

• Actual Length: 3.06m 

• Outside Diameter: 70mm 

• Inside Diameter: 59mm 

C9-4 QD 

(Quick Drive) 


Applications 

For driving into pre-formed window 

sampling holes although may also be 

used for shallow drive installations in 

very soft soils. Benefi ts from the fl ushcoupled 

Easy Connect system. 

Advantages 

• Reduced installation time 

• Small annulus to backfi ll 

• Steel nose cone 

• Compatible with In-Place Sensors 

(70mm OD only) 


70mm 2 metre drive section 

• Eff ective Length: 1840mm 

• Length: 2090mm 



• Cone Diameter: 76mm 

• Cone Material: Steel 

• Cone Taper Angle: 40° 

• Weight: 5.7kg 

70mm 1 metre section 

• Eff ective Length: 1m 

• Length: 1.06m 




58mm Outside Diameter 

version available. 

C18 

Standard 


Applications 

For use in conjunction with traversing 

or in-place inclinometer probes. The 

casing is made of ABS plastic and is 

simple to put together and install. 

Other features include: 

• Extruded grooves to perfectly 

fi t the shape of the inclinometer 

probe wheels 

• Self aligning keyways 

• Telescoping couplings available 

• Spiralling control to less than 0.3° 

per length 

• Two sizes available 

Performance 

• The ABS material is suitable for long 

term contact with all types of soils, 

grouts and ground water 

• Maintains its shape and fl exibility over 

a wider range of temperatures than 

PVC plastic 


• Material: ABS (Acrylonitrile 

Butadiene Styrene) 

• Groove Spiral: < 0.3° / 3m 

• Collapse Rating: 1960kPa (1770kPa) 

• Bend Rating: 3.07kN (2.65kN) 

• Maximum Temperature: 80°C 

• Tensile Strength: 705kgF (700kgF) 

• Torque: 520Nm (481Nm) 

Figures in brackets refer to 85mm diameter casing 

Dimensions 

70mm Diameter Length: 3m 



85mm Diameter Length: 3m 




5


6 

C17 

Vertical Digital 

Bluetooth Inclinometer 

Applications 

For the measurement of lateral 

displacement of soil, rock and 

man-made structures, including: 

• Shear-plane determination in natural 

and cut slopes 

• Monitoring lateral displacement of 

embankments and dams 

• Defl ections of concrete or asphalt 

• Upstream membranes on dams 

• Defl ection of bridge piers 

• Piled foundations 

• Abutments 

• Retaining and diaphragm walls 

• Stability of shafts, tunnels and 

underground works 

Performance 

• Readings acquired and displayed using 

Soil Instruments PDA-based software 

• Bluetooth technology, plus a remote 

handheld activator (the key fob) for 

taking readings, gives a complete 

wireless system 

• Strong lightweight cable 

• Easily charged from mains power 


• Probe Gauge Length: 500mm (metric 

system) or 24 inches (imperial system) 

• Probe Diameter: 28.5mm (1 1 /8” ) 

• Calibrated Ranges: ±30° (±250mm), 

±60° (±433mm) or ±90° (±500mm) 

• Resolution: 0.01mm (0.001”) 

• Sensor Accuracy: ±0.02% full scale 

(±0.1mm) for ±30° unit 

• Operating Temperature: -10 to +50°C 

• Repeatability: ±0.008% full scale 

• System Accuracy 1 : (Over 25m) ±2mm 

for ±30° unit 

• Minimum Casing Internal 

Diameter: 48mm 

• Maximum Casing Internal 


1 Derived empirically from surveys that 

include systematic and random errors 

introduced by casing, probe and operator. 

C19 

Horizontal/Inclined Digital 

Bluetooth Inclinometer 

Applications 

For the measurement of continuous 

profi le vertical movements including 

settlement and heave of: 

• Storage tank and building foundations 

• Monitoring of bridge abutments 

and piers 

• Construction control of road/rail 

embankments 

• Landfi lls 

Performance 

• Readings acquired and displayed using 

Soil Instruments PDA-based software 

• Bluetooth technology, plus a remote 

handheld activator (the key fob) for 

taking readings, gives a complete 

wireless system 

• Gives a continuous profi le of 

vertical displacements 

• No vertical rods or tubes to interfere 

with construction activities 

• Support software provides 

graphical plots 

• Strong lightweight cable 

• Easily charged from mains power 


• Probe Gauge Length: 500mm 

• Probe Diameter: 44mm 

• Calibrated Range: ±10° 

• Resolution: 0.01mm 

• Sensor Accuracy (Standard): ±0.028% 

full scale (±0.05mm) 



• System Accuracy 1 : (Over 25m) ±2mm 





1 Derived empirically from surveys that 

include systematic and random errors 

introduced by casing, probe and operator. 

C13 

In-site Inclinometer 

Software 

Applications 

In-Site is a Windows based program 

designed for inclinometer data 

reduction, graphing and reporting. 

Features include: 

• Project database in Microsoft Access 

database format 

• Data entry by direct retrieval, 

fi le import or manual input 

• Multiple databases can be opened 

at the same time 

• Inclinometer data can be copied 

between databases by drag-and-drop 

• Report can be previewed on screen 

before printing and company 

logo added 

• Dongle for single user licence 

• Comprehensive suite of functions 

for data management, data reduction, 

statistical analysis, graphical and 

tabular presentation

C1 

Inverted and Hanging 

Pendulum Systems 

Applications 

For monitoring of lateral movements 

in structures: 

• To measure displacements in dams, 

dam foundations and abutments 

• To determine the structural and 

foundation movements of tall buildings 

• For use as a primary reference for 

geodetic surveying 

An automatic co-ordinator is also 

available for both inverted and hanging 

pendulum systems. 

Performance 

• Accuracy better than precise 

geodetic surveying 

• Frequent reading intervals without 

repeated and costly surveys 

Specifi cations – Manual System 

• Range: ±75mm in X and Y 

• Accuracy 1 : ±0.1mm 


• Repeatability 2 : ±0.05mm 

• Weight: 4kg 

Specifi cations – Automatic System 

• Range: ±50mm in X and Y 

• Repeatability: ±0.1mm 

• Resolution: ±0.01mm 

• Operating temperature: -15 to +60°C 

• Output: RS-485A or 4-20mA signal 

1 Accuracy of the digital scale 

2 Dependent on operator experience 

C12 

In-Place 

Inclinometer 

Applications 

For the automated near real time 

measurement of lateral displacement 

of soil, rock and man-made structures 

including: 

• Direction of movement in natural 


• Monitoring lateral displacement of 


• Defl ections of concrete or asphalt 

upstream membranes on dams 

• Defl ection of bridge piers 

and abutments 

• Piled foundations 

• Retaining and diaphragm walls 

• Stability of shafts, tunnels and 


Performance 

• Sensors are robust and can be extracted 

from one project to be supplied to 

subsequent projects, after recalibration 

• Very economical compared 

with other systems 

• Multiplexed version 

(single cable) available 

• Horizontal and inclined versions 

also available 


• Calibrated Ranges: ±5°, ±10° or ±15° 

• Resolution 1 : 0.008% full scale 

• Sensor Accuracy: ±0.05% full scale 







• Weight (without Cable): 540g 

• Dimensions: 192mm x 32mm Ø 

• Signal Output: ±2.5V 

• Current Consumption: 5mA 

• Ingress Protection: IP68 to 200mH 2 O 

(2000kPa) 

• Housing Material: Stainless Steel 

1Dependent on readout equipment 

(CR1000) 


7


8 

DATA ACQUISITION

D1 

Dataloggers 

Applications 

The D1 Logger is a rugged 

measurement and control system that 

delivers accurate, reliable measurements 

in a variety of situations. 

The D1 Logger combines the ability 

to measure virtually all sensors 

manufactured or supplied by Soil 

Instruments with control capability to 

respond to specifi c site conditions. 

The system allows the utmost fl exibility 

in methods to power the unit as well as 

a variety of choices on how to retrieve 

data, from direct connection through to 

satellite communication. The datalogger 

easily adapts to all conditions. 

Together with an easily accessible 

multiplexer, Soil Instruments can design 

protection from lightning transients 

with surge arrestors so that the sensors 

and data are protected. 

The datalogging system can be combined 

with I-Site software to allow password 

protected internet access to near real 

time data from large or small projects. 

D2 

I-Site Software 

Applications 

The I-Site software suite is a dedicated 

software package developed to allow 

quick, easy interpretation of large 

amounts of data. Designed to operate 

with all the instruments manufactured 

and supplied by Soil Instruments. In 

addition, Robotic Total Stations and 

survey data can be fully integrated. 

I-Site is adaptable and can easily be 

confi gured to diff erent project needs. 

It provides a graphic or pictorial 

overview of the site and contains a 

highly advanced graphical engine 

allowing graph parameters to be 

changed with ease. 

I-Site can be set up to replicate itself 

to a password-protected website. 

Full alarm and alert functionality are 

included. It also contains fi elds for the 

easy introduction of any calibration 

factor or off set a sensor may require. 

D3 

Net-Site Web Based 

Software 

Applications 

Net-Site is an internet software package 

which replicates the graphical, graphing 

and profi le capabilities of I-Site but in a 

wholly web based environment. 

Users log on to their dedicated Net-Site 

job using a unique site code and 

password. Once logged on, they can 

view Maps, Charts and Profi les for all 

their projects set up within the Net-Site 

database. Net-Site is designed to remove 

the need for a dedicated PC on site. 

Data are automatically uploaded to the 

web and processed ready for instant 

access to Net-Site users. 

Access to Net-Site is possible from any 

internet enabled PC. 

As with I-Site, Net-Site can process 

and display data from any instrument 

manufactured by Soil Instruments as 

well as data from Robotic Total Stations. 

Full click and zoom as well as alarm 

functionality exists within Net-Site, 

these major I-Site features are not 

downgraded for Net-Site users. 

Net-Site is available on a monthly fee 

basis and is run on a dedicated server 

suite in the UK, with 24/7 backup 

(web-server only). There is no 

practical limit to the number of sensors 

which can be included. 


9

10 


CA1 

Instrument 

Cable 

Applications 

Instrumentation used to measure the 

performance and safety of structures 

requires secure connections between 

the sensors and the readout locations. 

It is essential that adequate 

consideration is given to the cables. 

Soil Instruments uses the highest quality 

cables, manufactured to British and EC 

standards. They have excellent electrical 

properties, are waterproof and suitable 

for burial in soil or concrete over long 

periods of time. 

Typically, the cables are armoured 

(especially in earth dams) with a high 

resistance to tensile loading; PVC 

sheathing provides waterproofi ng 

(although other jackets are available) 

and shielded pairs with individual 

drain wires provide for electrical 

noise protection. 

Cables with 2 to 48 conductors 

are available. 

CF2 

Wireless Network 

Module 

Applications 

The Soil Instruments Wireless Network 

Module is a low cost Wireless Enabled 

Data Logging Module capable of reading 

all sensors in the Soil Instruments 

product range. 

Containing a full suite of signal 

processors, ADCs, fl ash memory, 

ancillary device drivers and self 

diagnostic facilities, as well as a 

programmable Microcontroller allowing 

for the addition of custom fi rmware 

routines, the module can be rapidly 

adapted to measure almost any sensor 

type required. Its high specifi cation 

components and thoroughly tested 

design mean that it matches or betters 

traditional dataloggers in terms of 

resolution, accuracy and stability. 

The module receives commands and 

reports its information back via a 

wireless mesh network, with each 

module a transceiver unit acting as an 

intelligent repeater within the network. 

In this way information can be relayed 

to more remote modules 

or automatically rerouted 

around major obstructions. 

This means that as a site 

develops, the network 

automatically adapts to 

the changing construction 

environment, ensuring that 

uninterrupted access to your 

data is maintained throughout 

the duration of the project. 

Every module has a serial port 

which allows for easy connection 

with any laptop, datalogger, 

readout unit or off site telemetry 

equipment, such as a GPRS modem. 

From any serial port, every module 

on the network can be queried and 

controlled, calibration records uploaded 

and stored, historical data retrieved and 

logging parameters altered, allowing for 

sites to be administered from accessible 

locations, positions of safety, or even 

from the offi ce. 

• I nterfaces with all Soil 

Instruments Sensors 

• Interoperable with 4-20mA, 

Pulse, Digital I/O, Thermistors and 

PRT sensors. 

• Industry leading measurement 

accuracy and resolution (up to 

24 Bit ADC) 

• Licensed to operate globally on the 

2.4GHz ISM band 

• Simple setup of robust self-healing 

network 

• Expandable onboard memory for 

sensor data, calibration records, 

lookups and engineering notes 

• TTL level RS232 serial port for 

wired Comms 

• Easily multiplexed to run multiple 

sensors on one module 

• Multi year battery life 

• Up to 120m module to module range

EXTENSOMETERS 


11 

11


12 

EXTENSION

E2 

Magnetic Probe 

Extensometer 

Applications 

For the measurement of soil and rock 

movements including: 

• Settlement and heave in foundations 

and embankments 

• Subsidence 

• Movement of natural and cut slopes, 

quarry and mining excavations 

• Relaxation of rock around tunnels and 

other underground openings 

Performance 

• Reliable, accurate, simple to install 

and read 

• Magnets and tubing can be reduced 

or added 

• One probe reads at many locations 


• Range 1 : 30m, 50m, 100m, 150m, 200m 

• Resolution: 1mm 

• Repeatability 2 : ±2mm 

• Operating Temperature Range: 

-30 to +80°C 

• Gradations: mm/cm/m 

• Indicators: Audio & Visual 

• Probe Material: Stainless Steel 


• Tape Type: Contoured / Shaped 

copper conductors 

• Tape Material: Steel / 

Polypropylene Coated 

• Reel Material: Steel Frame / 

Polypropylene Hub 

• Battery Life: 12 Hrs continuous use 

1 Longer lengths available 


E3 

Digital Tape 

Extensometer 

Applications 

For the measurement of surface 


• Radial movements and convergence 

of tunnels, shafts, linings and caverns 

• Deformation of excavations in 

underground power houses, caverns 

and adits 

• Displacements of retaining walls, 

cuttings, bridge piers, arches 

and abutments 

Performance 

• Can be operated by one person 

and read from one end 

• Ideal for relative measurements 

• One unit reads at many locations 

• Variety of reference studs available 


• Range: 20m, 30m or 50m 



• Repeatability 2 : 0.1mm 


• Tape Tension: 11kg 

• Optical Tension Indicator 

• Weight Excluding Tape: 1kg 

• Power Off : automatic 

• Power On: automatic (upon 

movement of the micrometer) 

1 Accuracy of the micrometer 


E7 

Vibrating Wire Soil 

Extensometer 

Applications 



• Lateral strains and settlement 

• Foundation movements and subsidence 

• Slope and excavation control 

• Joint and fault displacement provides 

profi le of extension if chained in series 

Performance 

• Accuracy unaff ected by cable length 

• Strong, fl exible armoured cable 

• Full remote reading and data logging 

facilities available 

• Cable lengths in excess of 

1000m possible 


• Range: 300mm 

• Resolution 1 : 0.025% range 

• Accuracy: ±0.2% full scale 


1 Dependent on readout 


13 

13

14 


E10 

Rod 

Extensometer 

Applications 



• Relaxation of rock around tunnels 

and other underground openings 

• Foundation settlements 

• Monitoring of subsidence 

• Control of natural and cut slopes 

• Quarry and mining excavations 

• Displacements of retaining walls 

• Bridge piers and abutments 

• Monitoring of in situ tests 

• Pile load testing 

Performance 

• Avoids creep and kinking associated 

with tensioned wire systems 

• Rods can be stainless steel or fi breglass, 

depending upon the application 

• Can be connected to vibrating wire 

displacement transducers 

• Full remote reading and data logging 

facilities available 

• Operating lengths in excess of 

100m possible 

• Multiple installations within 

one borehole 

• Choice of anchor type 


Choice of readout: 

Manual 

• Operating range: 50mm and 100mm 

dial gauge, 25mm digital gauge 

• Resolution with digital depth 

gauge: 0.01mm 

• Accuracy: ±0.05mm 

Remote 

• Operating range: up to 100mm 

• Resolution: 0.025% of range 



Choice of anchors 

• Groutable – for competent rock 

• Hydraulic – for fi rm soil/soft rock 

• Packer – for weak soils 

Choice of rods 

• Fibreglass 

• Stainless Steel 

Choice of head confi guration 

• Single point 

• Multiple point – 

Manual: up to 8 rods 

Remote: up to 6 rods


15


16 

JOINT/CRACK

J1 

Vibrating Wire 

Embedment Jointmeter 

Applications 

For embedment in concrete 

across joints: 

• Construction joints in concrete 

structures 

• Tunnel and shaft linings 

• Masonry structures 

• Bridge construction 

• Dam construction 

Performance 

• Accurate, robust and very good 

long term stability 

• Suitable for remote reading and 

data logging 

• Strong, fl exible screened cable 




• Ranges: 50mm and 100mm 



• Temperature Range: -20 to +80°C 

• Material: PVC/Steel case, 316 Grade 

Stainless Steel Sensor 

• Ingress protection: IP68 to 1700 kPa 


J2 


Crackmeter 

Applications 

Mounted across joints or superfi cial 

cracks by installing on a pair of anchor 

stems. The crackmeter measures the 

magnitude of movement in: 

• Rock and soil structures 




• Superfi cial cracks 


Performance 




data logging 

• Strong, fl exible screened cable. 



• Waterproof construction 


• Ranges: 30mm, 50mm and 100mm 




• Weight Less Cable: 190g 212g 254g 

• Dimensions 2 : 290 x 19mmØ, 

340 x 19mmØ, 450 x 19mmØ 

• Material: 316 Grade Stainless Steel 


1 Dependant on readout 

2 In the closed position 

J3/J4 

Vibrating Wire Triaxial 

/ Perimetric Jointmeters 

Applications 

For the remote and automated 

measurement of magnitude of 

movement across three construction 

joints and fi ssures in three axis. 

• Construction joints in concrete dams 

and dam structures 

• Rock structures 

• Tunnel and shaft lining 


• Perimetric joint of concrete faced 

rockfi ll dam 

• Remote and automated monitoring 

Performance 

• Accurate, robust and very good long 

term stability 

• Corrosion resistant frames and stainless 

steel measuring/reference points 

• Groutable anchors 

• Strong, screened cable 

• Transducers sealed up to 25bar 

(perimetric) 




data logging 


• Ranges: 30mm, 50mm and 100mm 



• Temperature Range: -20 to +80˚C 

• Transducer material: 316 Grade 

stainless steel 


standard, 2500 kPa Perimetric 

1 Dependant on readout 


17



18 

J5 

Mechanical Triaxial 

Jointmeter 

Applications 

For manual measurement of magnitude 

of movement across construction joints 

and fi ssures in three orthogonal axis. 

Accessible construction joints in: 

• Concrete dams and dam structures 

• Rock structures 

• Tunnel/shaft lining 


Performance 

• Accurate and robust mechanical design 

• Corrosion resistant frames and 

stainless steel measuring / 

reference points 

• Groutable anchors 

• Choice of dial or digital gauge 


• Standard range 1 : ±12mm 



1 Other ranges available 

2 Dependant on gauge type 

J6 

Linear Potentiometer 

Crackmeter 

Applications 

Mounted across joints or superfi cial 

cracks by installing on a pair of anchor 

stems. The crackmeter measures the 

magnitude of movement in: 

• Rock and soil structures 




• Superfi cial cracks 


Performance 


long term stability. 


data logging. 

• Strong, fl exible screened cable. 


• Ranges 1 : 25mm, 50mm and 100mm 




• Cable Length: 1m (STD) 10m (Option) 

• Ingress protection: IP66 

1 Other ranges available (Up To 350mm) 

2 Dependant on readout

LOAD 

L2 


Load Cell 

Applications 

For the measurement and control of 

load including: 

• Loads in rock bolts 

• Tension in cable anchors and tendons 

• Loads and structural beams loads 

in piles 

• Loads between tunnel lining 

• Segments 

• Proof loading and pull-out tests on 

trial anchors 

Performance 

• Accurate, robust and very good long 

term stability. 3 to 6 gauges utilised 

depending upon the cell capacity 

• Negligible temperature eff ects 

compared with oil-fi lled load cells 

• Cables are strong, screened, fl exible 

and can exceed 1000m 


• Standard ranges: From 100 to 5000 

kN (10 to 500 tonnes) 

• Accuracy: On all ranges ±0.5% 

full scale 

• Temperature range: -20 to +80°C 

• Over-range capacity: 150% of full scale 


19 

19


20 

PRESSURE

P6 


Pressure Cell 

Applications 


pressures including: 

• Total pressures and stress distribution 

within embankments and dams 

• Contact pressures on diaphragm and 

retaining walls, piers and abutments 

• Foundation bearing pressures 

• Pressures on and within linings of 

underground excavations 

• Stresses in the rock walls of unlined 

caverns and tunnels 

Performance 

• Accurate, reliable and robust with 


• Various ranges available 

• Strong, armored and fl exible 

connecting cable can be in excess 

of 1000m 

• Full data logging capability allows 

rapid data storage on site 

• Stainless Steel cell 

• Single and double active sides available 

• Oil fi lled 


• STD Ranges (kPa): 300; 500; 700; 

1000; 1500; 2000; 3000; 4000; 6000; 

10,000; 15,000 


(minimum) 

• Accuracy 2 : 0.1% full scale 

• Linearity 2 : 0.1% full scale 


• Over Range: 150% of full scale 

• Material: Stainless Steel or Powder 

Coated Steel 


2 Of the pressure transducer 

P9 

Push-In Vibrating 

Wire Pressure Cell 

Applications 


earth pressure including: 

• Total pressures and stress distribution 

within embankments and dams 

• Radial, horizontal and vertical stresses 

around tunnels 

• Total pressure within tailing dams 

• Foundation bearing pressures 

• A piezometer is integrated into the 

system allowing the pore pressure 

to be subtracted from the total 

pressure, thus allowing the soil 

pressure to be obtained 

Performance 




• Strong, screened and fl exible 

connecting cable can be in excess 

of 1000m 

• Full data logging capability allows 

rapid data storage on site 



• STD Ranges (kPa): 300; 500; 700; 

1000; 1500; 2000; 4000 






• Material: Powder Coated Steel Cell 



P10 

Vibrating Wire Concrete 

Stress Cell 

Applications 

For the measurement and control 

of tangential and radial stresses in 

shotcrete tunnel linings as used with 

the Shotcrete style of tunnelling: 

• Monitoring and control of 

construction by the Shotcrete Tunnel 

Construction Method 

• Pressures on and within linings of 

underground excavations 

Performance 

• A compensation tube is incorporated 

to expand the cell after the concrete 

has hydrated 



• Low, medium and high pressure 

ranges available 

• Stainless Steel Cell 



• STD Ranges (kPa): 300; 500; 700; 

1000; 1500; 2000; 3000; 4000; 6000; 

10,000; 15,000 


(minimum) 





• Material: Stainless Steel 




21 

21


22 

READOUTS

RO-TB 

Terminal 

Boxes 

Applications 

Various types of terminal boxes 

are produced according to project 

requirements. 

Small Terminal Box – Non-switching 

• These boxes are inexpensive units for 

terminating vibrating wire, thermistors 

and 2 wire type instruments 

• Manufactured to cater for 1 to 6 

instruments only and constructed 

from die cast aluminum 

Switched Terminal Unit 

• For vibrating wire, thermistors and 

other 2 wire type instruments. 

Composed from epoxy grey painted 

fi breglass with lockable-hinged door, 

sealed with a Neoprene gasket 

• Equipped with a rotary switch to select 

the correct transducer. Standard units 

cater for 12, 24 or 48 instruments 

Junction Box 

• For projects that require cables from 

multiple instruments to be integrated 

into a multicore cable. Standard units 

cater for 12, 24, or 48 instruments 

Terminal/Junction Box-Switching 

• For projects that require multiple 

instrument cables to be integrated 

into a single multicore cable but 

also have the ability to take manual 

readings at this point 

Surge protection units available. 

Non standard terminal units and 

junction boxes can be produced to suit 

customers’ special requirements. 

RO-1-VW1 


Data Recorder 

Applications 

The vibrating wire data recorder is 

capable of reading most commercially 

available vibrating wire instruments. 

Features include: 

• Readout in engineering units 

• Date and time stamped data recording 

• Sleep mode to minimise 

power consumption 

• Storage capacity for over 

1,000,000 readings 

• Rechargeable battery 

• Auto switch off 

• Advanced user interface 

• Site, location and sensor ident 

management 

• Open and short circuit detection 

• Audio output 

Performance 

• The data recorder and associated 

electronics are housed in a shockproof 

and watertight case with hinged 

viewing panel, it is well suited for 

harsh environments 


• Excitation Range: 400 - 6000Hz 

5 Volt Square Wave 

• Excitation Type: Frequency Sweep 

• Accuracy: ±50ppm 

• Resolution: 0.1 in frequency units and 

0.01 in engineering units 

• Data recording units: Hz, Period x 10 7 , 

F2/1000 and engineering units 


• Programmable instrument 

channels: >1000 

• Reading storage capacity: >1,000,000 

• Thermistor type: 3k and 10k 

• Thermistor range: -50 to +150°C 

• Thermistor accuracy: ±0.5°C 

• Thermistor resolution: 0.01°C 

RO-VW3 


Handheld 

Applications 

The vibrating wire readout is a 

robust unit capable of reading most 

commercially available vibrating wire 

instruments. Features include: 

• Readout in frequency, frequency 

squared and period units 

• Four sweep ranges 

• Reads temperature thermistors 

(3K type) 

• Auto switch off 

• Powered by rechargeable/replaceable 

AA batteries 

Performance 

• The unit is housed in a IP67 rated 

enclosure, then encased in a 

protective rubber jacket, ensuring 

the unit can survive the harshest of 

conditions. The lightweight unit is 

easy to use and utilises the latest 

surface mount technology 


• Excitation Range: 450 - 6000Hz 

5 Volt Square Wave 

• Excitation Type: Frequency Sweep 

Via 4 User Selectable Ranges 

• Accuracy: ±1Hz 

• Resolution: 0.1 

• Display Units: Hz , Period x 10 7 , F2/1000 

• Operating Temperature: -10 to + 50°C 

• Thermistor Type: 3k 

• Thermistor Range: 0 to +60°C 

• Thermistor Accuracy: ±0.5°C 

• Thermistor Resolution: 0.1°C 


23 

23


24 

SETTLEMENT

S1 

Hydraulic Overfl ow 

Settlement Cell 

Applications 

For the remote measurement of vertical 

movement at discrete, inaccessible 

points within and beneath: 

• Road / rail embankments and rock 

/ earth-fi ll dams 

• Hydrocarbon storage tanks 

• Building foundations 

• Bridge piers, abutments and 

retaining walls 

Performance 

• Simple, accurate and inexpensive 

• Reliable in long-term monitoring 

• Unaff ected by temperature or 

barometric pressure changes 

• No vertical rods or tubes to interfere 

with construction activities 

• Up to 300m tubing lengths can 

be used as standard 

• Requires manual reading and 

maintenance 

• Reading elevation needs to be the 

same as monitored point elevation 


• Standard ranges: 1 or 2.5m 

of settlement 


• Accuracy 1 : ±1mm 


1 Dependant on operator experience 

S8 


Settlement Cell 

Applications 


vertical movements including: 

• Dam and embankment settlement 

• Settlement and heave of building 

foundations and storage tanks 

• Construction control of marine fi lls 

• Settlement of bridge piers 

and abutments 

• Monitoring of landfi lls 

• Both borehole and trench 

types available 

Performance 

• Accurate, robust and good long 

term stability 


data logging 

• Measurements at locations 

inaccessible to other instruments 

• Unaff ected by minor lateral 

movements 


• Ranges (kPa): 150; 300 

• Materials: PVC case, 316 Grade 

Stainless Steel sensor 


• Linearity: ±0.1% full scale 


(minimum) 


• Diaphragm Displacement: < 0.001 

cm 3 



S17 

Hydrostatic Digital Bluetooth 

Profi le Gauge 

Applications 


vertical movements including: 

• Construction control of roads, 

embankments and earth dams 

• Settlement and heave of oil tanks 

and building foundations 

• Control of subsidence 

Performance 

• Simple and reliable, probe calibration 

can be checked at any time 

• Gives a complete horizontal profi le 

of vertical displacements 

• Readings of elevation and distance are 

stored in the PDA 


• Range: +1m to -3.5m 


• Accuracy: ±10mm 





25 

25


26 

STRAIN

ST1 

Vibrating Wire Spot 

Weldable Strain Gauge 

Applications 

For the measurement of strain in steel 

structures including: 

• Piles 

• Beams 

• Bridges 

• Reinforcement bars 

• Tunnel linings 

• Suspension bars 

Performance 

• Robust, reliable and easy to use 

• Can be used with long cable lengths 

with no degradation of signal 

• Spot weldable strain gauge has a 

removable coil unit. The gauge is low 

profi le for installation on rebar and 

areas where access is limited 


data logging 

• Thermistor incorporated in coil housing 


• Range: 3000 Microstrain 

• Resolution1 : 0.4 Microstrain 



• Active Gauge Length: 50.4mm 

• Sensor Material: Stainless Steel 


ST2 

Vibrating Wire Arc 

Weldable Strain Gauge 

Applications 

For the measurement of strain in steel 

structures. Designed to be arc welded 

to steel structures such as: 

• Piles 

• Beams 

• Bridges 

• Reinforcement bars 

• Tunnel linings 

• Suspension bars 

Performance 




• The gauge is low profi le for 

installation on rebar and areas where 

access is limited 

• Strain gauge can be adjusted to 

allow for the most eff ective use 

of its range 



data logging 



• Resolution 1 : 1 Microstrain 

• Accuracy 2 : ±0.1% full scale 





2 ±0.1%full scale with individual 

calibration, ±0.5%full scale with 

standard batch calibration 

ST3 

Concrete Surface Mount 

Strain Gauge 

Applications 

For the measurement of strain in 

concrete structures, including: 

• Concrete Members and Struts 

• Monitoring of strain due to load 

• Bridges & Dams 

• Monitoring strain and load during 

construction and service life 

• Piles and Mass concrete 

Performance 




• Strain gauge can be adjusted to allow 

for the most eff ective use of the range 



data logging 











standard batch calibration www.soil.co.uk 27

28 


ST4 

Vibrating Wire Embedment 

Strain Gauge 

Applications 

For the measurement of strain in concrete. 

Primarily designed to be directly 

embedded in structures including: 

• Piles 

• Concrete Beams 

• Bridges 

• Foundation slabs 

Performance 




• The gauge is low profi le for 

installation to reduce the 

“inclusion eff ect” 


datalogging 







• Active Gauge Length: 150mm 





standard batch calibration 

ST5 

Re-bar 

Strain Gauge 

Applications 

For the measurement of strain in the 

reinforcing bars in concrete. Primarily 

designed to be directly embedded in 

structures including: 

• Piles 

• Concrete Beams 

• Bridges 

• Foundation slabs 

Performance 





datalogging 




• Resolution 1 : 0.4 Microstrain 



• Length: 1400mm 

• 16mm diameter 

• Material: Steel 

1 Dependent on readout


29


30 

TEMPERATURE

T2 

Resistance 

Temperature Sensor 

Applications 

For measuring temperature in 

concrete, soil and rock including: 

• Monitoring the temperature during 

the curing of concrete 

• Soil and rock temperature adjacent to 

ground freezing operations and liquid 

gas storage tanks 

• Interpretation of temperature eff ects 

on other installed instruments 

• Measurements of water temperatures 

in reservoirs and boreholes 

• Air temperature measurements on 

structure surfaces 

• Interpretation of temperature related 

stress and volume changes in dams 

Performance 

• Accurate, robust, high resolution 

and good long term stability 

• Suitable for remote reading, scanning 

and data logging 

• Strong, screened and fl exible cable 

Specifi cations PT100 thermistor 

• Range: -30 to +100°C 

• Accuracy: ±0.2°C 

• Resolution1 : 0.01°C 


T3 


Tempreture Sensor 

Applications 



• Monitoring the temperature during 

the curing of concrete 

• Soil and rock temperature adjacent to 

ground freezing operations and liquid 

gas storage tanks 

• Interpretation of temperature eff ects 

on other installed instruments 

• Measurements of water temperatures 

in reservoirs and boreholes 

• Air temperature measurements on 

structure surfaces 


stress and volume changes in dams 

Performance 

• Accurate, robust, high resolution 

and good long term stability 

• Suitable for remote reading, scanning 

and data logging 

• Strong, screened and fl exible 

connecting cable can exceed 1000m 

Specifi cations Vibrating wire 

• Range: -20 to +80°C 

• Accuracy: ±0.5% of full scale 

• Resolution1 : 0.03°C 


T4 

Thermocouple 

Temperature Sensor 

Applications 



• Monitoring temperature evolution 

during concrete curing 

• Monitoring seasonal variations 

of temperature within the ground 

and structures 


stress and volume changes in mass 

concrete structures 

• Determination of critical moment 

for injecting of joints within mass 

concrete structures, such as concrete 

dams and storage tank bases 

Performance 

• Low cost temperature 

monitoring instrument 

• Reasonably accurate, fast response, 

with good long-term stability 

• Suitable for either manual or 

data-logged reading 

• Lightweight cable for easy handling 

• Cable not suitable for use in 

deformable materials 

• 100m cable lengths possible 


• Range: -10 to +100°C 

• Accuracy: ±1°C 

• Resolution 1 : 0.1°C 

1 Dependent on readout www.soil.co.uk 

www.soil.co.uk 31 

31


32 

TILT

TLT1 

Electrolevel Beam 

Sensor 

Applications 

For the monitoring of diff erential 

displacement of structures including: 

• Buildings and structures adjacent to 

deep excavations and diaphragm 

wall construction 

• Buildings and structures aff ected by 

tunnelling and mining 

• Monitoring structures undergoing 

foundation treatment, compensation 

grouting and underpinning 

• Storage tanks 

• Retaining walls 

• Subsidence and landslips 

Performance 

• Robust, accurate, simple and reliable 

• Good long term stability 

• Versatile and suitable for many situations 

• Inexpensive sensor to allow for automatic 

data logging 

Specifi cations – Horizontal 

• Range: ±45 Arc Minutes (±13mm/m) 

• Accuracy 1 : ±0.1mm/m 



• Excitation Voltage: 2.5v AC 

• Current Consumption: < 1 μA 

• Output Signal: Ratiometric AC 


• Zero Adjustment Range: ±5° 

Specifi cations – Vertical 






• Current Consumption: < 1 μA 

• Output Signal Ratiometric AC 


• Zero Adjustment Range: ±5° Fine 

Adjustment: ±25° Course 

• Ingress Protection: IP66 

1Accuracy within precision range 

(±14 arc minutes) 

2Resolution dependent on readout (CR1000) 

TLT2 

Tiltsensor 

Applications 

For the monitoring of discrete points on structure including: 

• Buildings and structures adjacent to deep excavations and diaphragm 

wall construction 

• Buildings and structures aff ected by tunnelling and mining 

• Monitoring structures undergoing foundation treatment, compensation 

grouting and underpinning 

• Storage tanks 


• Subsidence and landslips 

Performance 


• Robust, accurate, simple and reliable 

• Good long term stability 

• Versatile and suitable for many situations 

• Inexpensive sensor to allow for automatic data logging 

Specifi cations – Electrolevel 






• Current Consumption: < 1μA 

• Output Signal: Ratiometric AC 


• Zero Adjustment Range: ±5° Fine 

• Adjustment: ±25° Course 


Specifi cations – MEMS Accelerometer 

• Range: MEMS Accelerometer 

• Range: ±3°, 5°, 10° 




• Excitation Voltage: 12v DC 

• Current Consumption: < 5mA 

• Output Signal: ±2.5 vDC Diff erential 



1 Accuracy within precision range (±14 Arc Minutes) 

2 Resolution dependent on readout (CR1000) 

TLTCF 

Cable Free Tiltsensor 

Specifi cations – CF Electrolevel 

• Range: ±15 Arc Minutes (±4.5mm/m) 

• Accuracy: ±0.1mm/m 

• Resolution: 0.12% Full Scale 

• Repeatability: ±0.25% Full Scale 


• Zero Adjustment Range: ±5° 

Fine Adjustment 

• Radio Type: External with 400mm 

link cable 

• Transmission interval: 15minutes 


33

34 


TLT3 

Bassett 

Convergence System 

Applications 

The most eff ective and accurate system 

to measure the movement of a tunnel 

section is by utilising Soil Instruments’ 

Bassett Convergence System. These 

systems use pairs of sensors to measure 

the change in movement of known 

lengths (or arms) to calculate a resultant 

of the total movement. 

By maintaining a low profi le on the 

tunnel lining, the system can be 

installed in tunnels allowing normal 

traffi c fl ow. 

Performance 

• No line of sight required 

• Near real time profi les of tunnel 

section generated 

• Low profi le keeps close to tunnel wall 

Specifi cations – Short arm Sensor 

• Range: ±10° 

• Resolution: 10 arc seconds 

Specifi cations – Long Arm Sensor 

• Range: ±34 arc minutes 

• Resolution: 1 arc second 

TLT4 

Digital Portable 

Tiltmeter 

Applications 

For the monitoring of discrete points on 

structure including: 

• Brick & Stone Buildings 

• Monitoring horizontal and vertical 

rotations (heave and settlement) due 

to adjacent construction activities and 

clay shrinkage 

• Bridges & Dams 

• Monitoring impounding and loading 

eff ects in short or long term 

• Pipelines 

• Monitoring diff erential levels 

• Tunnels 

• Monitoring vertical rotation and 

track formation 


• Monitoring horizontal and 

vertical rotations. 

Performance 

• Digital signal from sensor to PDA 

• No fi eld connections required, avoids 

water ingress and connection failures 

• Solid state electronics ensure long, 

trouble free use in a site environment 

• Light, easily portable by one person 

• PDA allows easy interface with most 

offi ce systems and applications 

• Enhanced PDA Software for ease of use 

and full data security 


• Range: ±10° 

• Accuracy: ±0.004° 

• Resolution: 0.001° 

• Repeatability: ±0.0012° 



• Dimensions: 160 x 135 x 150mm 

• Battery Life: >12hrs continuous use 

TMCF 

Cable Free Track 

Monitoring System 

Applications 

For the measurement of railway 

track deformation. 

• Capable of providing measurement 

of changes in track twist, cant and 

longitudinal settlement 

• Approved by Network Rail (UK) 

and conforms to EN 50121 

EMC regulations 

• Requires no vulnerable cables on or 

from the railway track 

Performance 

• Installation can be achieved rapidly 

during short track possessions 

• Rugged sensor technology with built 

in power supply 


• Accuracy: 0.1mm/m 

• Range: ±1° (±17.5mm/m) 

• Resolution: 0.12% full scale 


• Operating temperature: -20 to +50°C


35


36 

WATER

W1 

Standpipe 

Piezometer 

Applications 

Used for the measurement and 

control of water pressure in soil and 

rock, including: 

• Construction control and stability 

• Monitoring of embankments, 

dams, reservoirs and shallow 


• Stability investigations of natural 


• Control of de-watering and 

drainage operations 

• Hydrological investigations and 

water supply 

• Pollution and environmental studies 

Performance 

• Water level indicator is used as 

the readout 


• Ceramic tip: 300mm long x 50mm 

diameter 60 micron fi lter 

• Porous plastic tip: 300mm x 32mm 

diameter 60 micron fi lter 

• Drive-in tip: 300mm x 43mm diameter 

60 micron fi lter 

W2 

Hydraulic 

Piezometers 

Applications 


water pressures in soil and rock. 


monitoring of embankments, earth 

dams and their foundations 

• Uplift pressures and hydraulic 

gradients in dam foundations 

and abutments 

• In-situ measurements for permeability 

changes and evolution 

• Hydraulic Piezometer system 

renovation services 

Performance 

• Low cost, remote pore pressure 

monitoring instrument 

• Reliable and accurate in long-term use 

• Re-fl ushable circuits and tips, avoiding 

inaccuracies due to air entrapment 

• Tubing lengths as long as 


• HAE tip allows monitoring of negative 

pressures in partially saturated soils 

• Must be protected from freezing 

• Requires manual reading 

and maintenance 


Ranges: 

• Bourdon Gauge: –50 to +5000kPa 

• Digital readout: –50 to +2000kPa 

System accuracy: 

• Bourdon Gauge: ±1% full scale 

• Digital readout: ±0.25% full scale 

• De-airing pressures: Up to 1700 kPa 

W3 

Pneumatic 

Piezometers 

Applications 

The low cost measurement and 

control of water pressures in soil 

and rock, including: 

• Stability investigations of natural 


• Control of permeability testing, 

de-watering and drainage 


monitoring of tunnels and other 


• Stability monitoring of foundations, 


Performance 

• Simple, accurate and reliable design 

with over 30 years of use worldwide 


• Range: from -5 to +100m head 

of water 

• Accuracy: ±2% full scale 

• Total system accuracy is limited by 

the type of readout used 


37

38 


W4 

Vibrating Wire Piezometer 

- Heavy Duty 

Applications 

Ideal for use in dams or harsh 

environments where robust, long term 

monitoring is required. Designed for 

accurate measurement of pore water 

pressures in fully or partially saturated 

soil and rock, including: 

• Drawdown and recovery testing in 

pumping wells, observation wells 

and reservoir 

• Monitoring pore water pressures in 

foundations, embankments, retaining 

walls and dams 

• Stability of natural slopes 

• Stability investigations of tunnels, 

mines, pipelines and other 

underground engineering works 

Performance 

• Accurate and reliable design with 

over 20 years of use worldwide 

• Choice of fi lter option, either HAE 

(1 micron), LAE (60 micron) cylindrical 

or sintered Stainless Steel disc 

(50 micron). 


• STD Ranges (kPa): 150; 300; 500; 

700; 1000; 1500; 2000; 3000; 4000; 

6000; 10,000; 15,000 




• Resolution 1 : 0.025% 

full scale (minimum) 


• Diaphragm Displacement: < 0.001 cm 3 

• Diameter: 38mm 

• Weight (without cable & fi lter): 1.3kg 


1 Dependent On Readout 

W7 

Water level 

Indicators 

Applications 

For the measurement of water levels in wells, open standpipes and boreholes 

in soils and rock, including: 

• Site investigations 

• Water levels in open boreholes 

• Control of de-watering and drainage operations 

• Hydrological and hydro geological investigation of water resources 

• Stability investigations of natural and cut slopes 

• Pollution and environmental studies 

• In-situ permeability measurements 

• Pumping tests 

Performance 

• Reliable, simple to operate and read, with buzzer (audio) and 

light (visual) indication 

• Lightweight, portable and robust 

• Components are protected against corrosion and mechanical damage. 

• One instrument reads at many locations 

• Adjustable sensitivity 

• DIY tape replacement 


Probe Type: Shrouded 


• Probe Length: 230mm 


• Tape Type: Contoured / Shaped Copper Conductors 

• Tape Material: Steel / Polypropylene Coated 

• Width: 9.4mm 

• Graduations: mm/cm/m 

• Indicators: Audio & Visual 

• Sensitivity Control: Internal 

• Battery Life: 12 Hours Continuous Use 

• Reel Material: Steel Frame/Polypropylene Hub 

Probe Type: Unshrouded 


• Probe Length: 170mm 


• Tape Type: Flat Copper Conductors 

• Tape Material: Glass Fibre, Plastic Coated 

• Width: 6.2mm 

• Graduations: cm/m 

• Indicators: Audio & Visual Audio & Visual 

• Sensitivity Control: External 

• Battery Life: 24 Hours Continuous Use 

• Reel Material: ABS

W9 

Vibrating Wire piezometer 

- Standard 

Applications 

Designed for accurate measurements of 

pore water pressures in fully or partially 

saturated soil and rock, including: 


pumping wells, observation wells and 

reservoir embankments 

• Monitoring pore water pressures in 

foundations, embankments, retaining 

walls and small dams 





Performance 

• Available in ranges up to 4000kPa. 

• Choice of fi lter option, either HAE 

(1 micron), LAE (60 micron) or sintered 

Stainless Steel disc (50 micron) 


• STD Ranges: (kPa) 300; 500; 700; 1000; 

1500; 2000; 4000 




• Resolution 1 : 0.025% full scale (minimum) 


• Diaphragm Displacement: < 0.001 cm 3 


• Weight (without cable & fi lter): 190g 



W10 

V-Notch Weir 

Monitor 

Applications 

To monitor the change in water levels 

behind a V-Notch Weir drainage 

monitoring system. The main 

component is a cylindrical weight 

suspended from a vibrating wire force 

transducer. As the water level changes, 

the changing buoyancy force on the 

cylinder acts directly on the vibrating 

transducer. This is calibrated to 

engineering units. 

Performance 

• The system has high sensitivity 

and stability 


• Vibrating Wire Precision Water 

Level Sensor 

• Range: 300mm 

• Resolution 1 : 0.025% 

full scale (minimum) 

• Linearity: ±0.5%full scale 

• Operating Temperature: +5 to +60°C 

• Dimensions: 150 x 32mmØ 

• Weight: (sensor only) 600g 



W12 

Solid State 

Piezometer 

Applications 

Designed for accurate measurements of 

pore water pressures in fully or partially 

saturated soil and rock, including: 


pumping wells, observation wells 

and reservoir embankments 

• Monitoring pore water pressures 

in foundations, embankments, 

retaining walls and small dams 





Performance 

• Available in ranges up to 4000kPa in 

either absolute or gauge confi guration 

• Fitted with a 50 micron sintered 

Stainless Steel fi lter disc 





• Resolution 1 : 0.025% full scale (minimum) 


• Weight: (without cable) 100g 


• 4-20mA or 0-2.5V signal options 



39

CONTACT DETAILS: 

Soil Instruments Limited 

Bell Lane 

Uckfi eld 

East Sussex TN22 1QL 

United Kingdom 

Tel: +44(0)1825 765044 

Fax: +44(0)1825 761740 


E-mail: sales@soil.co.uk

SOIL INSTRUMENTS LTD

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