The Simple and Safe Method of CO2 Indication.

Monitor your CO2 concentration in a planted tank with the help of a CO2 indicator. Our set includes one CO2 indicator with a suction cup only. 

• Blue – insufficient CO2

• Green – sufficient CO2

• Yellow – too much CO2

How to Use

• Hold the indicator port straight up.
• Drip into the testing liquid, to reach about 1/2 of the sphere.
  
• Rotate the indicator, let testing liquid flows in to the sphere.
• Put the indicator vertically into the water and fix it on the wall of the tank.
• 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.

Size: 

• CO2 Indicator: H4.2cm x L4.6cm
• CO2 Indicator Tiny: H3.2cm x L3.5cm