• This product is used to detect the concentration of CO2 in water (Need to add testing liquid).
• Do not place the indicator above the CO2 diffuser outlet.

HOW TO USE:

1. Hold the indicator port straight up
2. Drip the testing liquid, to reach about ½ of the glass sphere.
3. Rotate the indicator, let testing liquid flow into the sphere.
4. Put the indicator vertically into the water and fix it on the wall of the tank.