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Colombo Co2 Indicator
Colombo CO2 Indicator, CO2 test, which measures CO2 levels in your planted aquarium. The drop checker is a relatively new invention and previously test kits were used. However, they only measured the levels at the time of the test where as the drop checkers measure it 24/7.
It's amazing the difference the way your plant will respond when you have the correct CO2 levels and this Colombo CO2 Drop Checker will be one of those tools that you won't believe you lived without for your tank.