Complete CO? Monitor Kit: Everything you need for precise CO? monitoring! Include curved glass tubing, a bottle of reagent solution, and 2 suction cups. Effortlessly keep track of the CO? level in your planted aquarium right at home Easy to Use: Simply add 20 drops of reagent into the tubing, and attach it vertically to your tank wall using a suction cup. (NOTE: The tubing opening must face down!) Accurate results will appear in about 2 hours. Extremely convenient and time-saving Simple Result Interpretation: Instant analysis at a glance through the reagent?s color changes ? Green or Light Green indicates perfect CO? balance; Yellow warns of excessive CO?; Blue signals insufficiency of CO?. No more guesswork in tank care Safe Reliable: Made of thick, smooth glass, the CO? drop checker won?t crack easily or scratch the delicate skin of your fish. Ultra-clear design ensures easy color reading. The strong suction cups provide secure, stable mounting at all times Essential CO? Indicator: A must-have for serious planted tank enthusiasts and aquarium professionals. Effectively help maintain optimal plant growth and fish vitality. Create your thriving underwater paradise with confidence Product description