Description: CO2 Indicator Dioxide Concentration Detector Set Long Time Drop Carbon Monitor Set ● 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. ● A CO2 drop checker is an essential tool for monitoring CO2 levels in the aquarium. The CO2 drop checker is a reservoir designed to contain an indicator solution and an airspace. ● When the drop checker is submerged in the aquarium, the carbon dioxide will outgas from the aquarium water into the airspace of the drop checker and will eventually be absorbed into the indicator solution. ● The carbon dioxide gas will seek a point of equilibrium between the indicator solution and the aquarium water. As equilibrium is achieved, the color of the indicator solution inside of the drop checker will change based on the concentration of CO2 in the aquarium water. Features: 1. Allows you to monitor the CO2 level in your tank . 2. Unique design prevents any chance of spilling the indicator solution. 3. Reusable color chart sticker allows the constant repositioning of the position of the label on the aquarium. How to use: 1. Take apart the CO2 Indicator. 2. Add 1cc of indicator solution to the reservoir then reattach the CO2 Indicator firmly. 3. Submerse the CO2 indicator vertically and attach to the desired location inside the tank by suction cup. 4. Stick the color chart on the glass wall of the tank ( the position to cover the suction cup ) to read the CO2 level in your tank. 5. Change solution every 2 - 4 weeks. Solution change at water change is NOT necessary. Package included: 1 set of CO2 concentration detector