ITEM NAME:Aquarium Fish Tank Carbon Dioxide CO2 Monitor Glass Drop Ball Checker Tester `US.A CO2 checker is an essential tool for monitoring CO2 levels in the aquarium. The CO2 checker is a reservoir designed to contain an indicator solution and an airspace. Maintaining proper Carbon Dioxide (CO2) levels in the planted aquarium is one of the most important factors in the health of the planted aquarium ecosystem.
