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A glass-made instrument created specifically for examining the CO2 level of aquarium with simple procedure. Add some pH reagent and aquarium water to Drop Checker. Then, set it inside the tank. Green is optimum, while blue is insufficient and yellow is excessive.
* Includes a pH reagent (5ml)
* In case the reagent turns yellow from the beginning, due the low pH value in the aquarium, the reagent color does not change even after adding further CO2. In such a case, please make a water change for raising pH level, and make sure the reagent turns blue or green before resetting Drop Checker in the aquarium.