Dymax CO2 Crystal Indicators

This easy-to-use drop checker accurately measures CO2 concentration by changing color based on the current CO2 level. The indicator solution turns from blue to green to yellow as CO2 levels increase. Optimal CO2 levels for planted aquariums are between 15 and 30 ppm, which corresponds to a green-light green color in the indicator solution.

Features

• Simple and reliable CO2 monitoring
• Clear color-changing indicator solution
• Durable acrylic drop checker
• Convenient suction cup attachment

Please note that the co2 solution is not included when purchasing the indicator. Any solution in the pictures are for illustrative purpose only.