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CO2 test kit

Hi. I have seen a CO2 test kit in a plant specific lab kit (iron, nitrate
and CO2) it was sold at both Petco and Petsmart. I wouldn't bother, you
measure your CO2 indirectly by measuring your KH and pH and using CO2
tables.  I've seen numerous versions of these tables, for starters there
is one on the Krib.