Different Ways To Measure Co2 In The Tank

xoedusk

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I'm compiling a list of different ways to measure CO2 levels in a tank. I know of the most common:
Code:
CO2_ppm = 3.0 * KH_deg * 10^(7-pH)
.

I do remember that there are other ways to measure it, such as a 24 hour drop test or something, but don't remember the details. Any ideas?
 

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