Cobella CO2 Drop Checker Clear Glass CO2 Indicator CO2 Capacity Monitor with Suction for Planted Aquariums

Product Detail : Name: CO2 Drop Checker Material: Glass High: approx.4.5cm (1.77'') Quantity: 1 Pc Product Features: Made of clear glass, high light and non-corrosive The CO2 drop checker is transparent, convenience for you observed it color turns. The indicator solution will turn from Blue to Yellow as dissolved CO2 levels increase. Easy to install and use. By keeping the drop checker solution near green at all times, aquarium can ensure optimal plant growth while keeping fish safe. blue represented CO2 insufficient; Turns green, the balance of CO2; Turns yellow, means your tank has too much CO2. Instructions: 1. Drop 5 drops of CO2 indicator(not include) into the glass checker. 2. Pour monitor to let  the CO2 indicator flow into the test area. 3. Use straw to fill the tank water with the test solution area to 1/2. 4. Turn the opening facing of drop checker down. 5. Use a sucker to attach it to the side of your tank and wait for up to 2 hours. Package Includes: 1 x CO2 Drop Checker Tips: Please allow 1-2cm size error due to hand measure. Color may be a little different due to monitor and light brightness from pictures.