Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction CupBrand: NilocG Aquatics Color: Clear Features: Complete Kit: Our aquarium water C02 drop checker monitor contains everything you need for efficient monitoring of CO2 levels in your tank. The fish tank C02 drop checker monitor includes the highest quality glass drop checker, suction cup, and a 60ml bottle of 4dkh pH reagent solution. Easy To Use: The user friendly CO2 detector is very convenient and gives you reliable reading in about 2 hours without