About This

• Fzone Superior glass CO2 drop checker with the most accurate and reliable 4dKH solution in the market
• Effortless and straightforward to install. Just add 15-20 drops into the CO2 checker, secure it onto the glass, after one hour for a precise 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
• Complete kit for monitoring CO2 contents. Package include 15ml 4dKH/PH solution. 1 piece CO2 drop checker, 1 piece suction cup.