preface to fifteenth edition

PRACTICAL LABORATORY INFORMATION 11.103
TABLE 11.41
Pipet Capacity Tolerances
Volumetric transfer pipets
Tolerances,* mL
Measuring and serological pipets
Tolerances,† mL
Capacity, mL
Class A Class B Capacity, mL
Class B
0.5 0.006 0.012 0.1 0.005
1 0.006 0.012 0.2 0.008
2 0.006 0.012 0.25 0.008
3 0.01 0.02 0.5 0.01
4 0.01 0.02 0.6 0.01
5 0.01 0.02 1 0.02
10 0.02 0.04 2 0.02
15 0.03 0.06 5 0.04
20 0.03 0.06 10 0.06
25 0.03 0.06 25 0.10
50 0.05 0.10
100 0.08 0.16
* Accuracy tolerances for volumetric transfer pipets are given by ASTM standard E969 and Federal Specification NNN-P-
395.
† Accuracy tolerances for measuring pipets are given by Federal Specification NNN-P-350 and for serological pipets by
Federal Specification NNN-P-375.
TABLE 11.42
Tolerances of Micropipets (Eppendorf)
Capacity, L Accuracy, % Precision, % Capacity, L Accuracy, % Precision, %
10 1.2 0.4 100 0.5 0.2
40 0.6 0.2 250 0.5 0.15
50 0.5 0.2 500 0.5 0.15
60 0.5 0.2 600 0.5 0.15
70 0.5 0.2 900 0.5 0.15
80 0.5 0.2 1000 0.5 0.15
TABLE 11.43
Buret Accuracy Tolerances
Accuracy, mL
Capacity, mL
Subdivision, mL
Class A* and
precision grade
Class B and
standard grade
10 0.05 0.02 0.04
25 0.10 0.03 0.06
50 0.10 0.05 0.10
100 0.20 0.10 0.20
* Class A conforms to specifications in ASTM E694 for standard taper stopcocks and to ASTM E287 for Teflon or polytetrafluoroethylene
stopcock plugs. The 10-mL size meets the requirements for ASTM D664.