• Made of high quality glass
• 3cm diameter, unique round form, very unobtrusive 
• Use to measure CO2 levels at a glance
• Package includes: glass ball drop checker and suction cup
• Please note that CO2 indicator solution is NOT included

• Maintaining the appropriate CO2 level is critical in a planted aquarium
• Too much CO2 may harm your fish, whereas too little CO2 decreases plant growth and allows algae to take over
• The CO2 indicator makes it easy for you to know the CO2 level inside the aquarium by comparing the color of the reagent