Glass CO2 Indicator

The ISTA Glass CO2 Indicator effectively and accurately monitors CO2 levels in your freshwater tank. Achieve appropriate CO2 levels in your tank to reduce harm and stress to your fish. Glass CO2 Indicator includes suction cup for ease of use. Easy to read colour changes make knowing how to adjust the CO2 levels in your underwater world a breeze. Indicator is made from high-quality clear glass, and is specifically designed for a no-spill experience. Solution will turn colour to give you a clear reading, if the solution is yellow, there is too much CO2 in your tank. If the solution is green, you have sufficient CO2 in your tank. If the solution is blue, you do not have enough CO2 in your tank.