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FZONE Aquatic CO2 Glass Drop Checker PH Momitor for Aquarium Plant Fish Tank Test CO2 Kit

Superior glass CO2 Drop Checker with the most accurate and reliable 4dKH solution in the market Quick and easy to setup. Simply fill the drop checker with the provided solution to half full, affix the checker to the glass, check back in one hour later for accurate reading Providing easy to read CO2 level. BLUE = Needs more CO2. GREEN = Sufficient CO2. YELLOW = Danger! Too much CO2. Constantly monitoring the CO2 level in the water column