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Laboratory-Grade pH And EC Meters - Here are high-end laboratory-grade EC meters, pH meters and probes that cost<br />
from several hundred to over a thousand dollars.<br />
pH Temperature Chart — Contrary to popular belief a pH<br />
of 7.0 is not always neutral; in fact it really depends on the<br />
temperature of your nutrient solution as the chart below<br />
shows. That’s why it’s critical to make sure you buy a pH<br />
meter that compensates for temperature.<br />
If you’re a fanatic to detail like I am<br />
you’ll want to have a pH meter with<br />
ATC because as your nutrient solution<br />
temperature changes so does<br />
the pH of your nutrients. When your<br />
nutrient temperature gets warmer<br />
your pH goes down, and when your<br />
nutrient temperature gets cooler<br />
your nutrient solution pH goes up.<br />
Here’s an interesting side note,<br />
a pH of 7 is considered to be<br />
pH neutral, but in fact is only an<br />
approximation and is accurate only<br />
at 25°C or 77°F. A true neutral pH<br />
is when the concentration of hydrogen<br />
ions (H+) is exactly the same<br />
as the concentration of hydroxide<br />
ions (OH-) and those concentrations<br />
are effected by temperature<br />
so your pH neutral point varies from<br />
pH 7.47 at 0°C or 32°F to pH 6.14<br />
at 100°C or 212°F.<br />
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