Description:<br /><br />CO2 Indicator Dioxide Concentration Detector Set Long Time Drop Carbon Monitor Set<br /><br />\u25cf Maintaining proper Carbon Dioxide (CO2) levels in the planted aquarium is one of the most <br />  important factors in the health of the planted aquarium ecosystem. <br />\u25cf A CO2 drop checker is an essential tool for monitoring CO2 levels in the aquarium. The CO2 drop<br />  checker is a reservoir designed to contain an indicator solution and an airspace.<br />\u25cf When the drop checker is submerged in the aquarium, the carbon dioxide will outgas from the <br /> aquarium water into the airspace of the drop checker and will eventually be absorbed into the <br /> indicator solution. <br />\u25cf The carbon dioxide gas will seek a point of equilibrium between the indicator solution and the <br /> aquarium water. As equilibrium is achieved, the color of the indicator solution inside of the drop<br /> checker will change based on the concentration of CO2 in the aquarium water.<br /><br />Features:<br />1. Allows you to monitor the CO2 level in your tank .<br />2. Unique design prevents any chance of spilling the indicator solution.<br />3. Reusable color chart sticker allows the constant repositioning of the position of the label on the aquarium.<br /><br />How to use:<br />1. Take apart the CO2 Indicator.<br />2. Add 1cc of indicator solution to the reservoir then reattach the CO2 Indicator firmly.<br />3. Submerse the CO2 indicator vertically and attach to the desired location inside the tank by suction cup.<br />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.<br />5. Change solution every 2 - 4 weeks. Solution change at water change is NOT necessary.<br /><br />Package included:<br />1 set of CO2 concentration detector