asy to use and see the concentration of CO2 in the fish tank. By taking a sample of water from the tank and mixing a drop of this indicator solution, you will see the solution turning into different colors from which each color indicates CO2 concentration in the water. A blue color means that CO2's concentration is too low, green means it is normal, and yellow means that CO2's concentration is too high, so it is causing harm to fish.
Indicator Colors: Blue, Green, Yellow
Dispensing Method: Drops
Net Content: 15ml
Size: 30mm x 60mm