I think most of us don't use C02 checkers, instead we use the pH kH relationship to determine our C02 levels.
Also, the need for the C02 checker is not there if you have constant levles of kH and pH and C02 injection
( In short, don't waste money la, go get a pH and kH test kit, cheaper and easier somemore. Buden make sure your tank kH and pH is not affected by anything else other than the water )
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