Whoasyst CO2 Glass Drop-Checker Most Accurate of Planted for Tank Levels Work with -Checker Aquarium Heater Light Thermometers Gravel Sand Decorations Filter Fish

C02 reagent not included

Specially for pressurized CO2 for tank

This is a very nice tiny Co2 Glass Monitor. glass

Easy maintenance, since it is not under water, it won'for t grow algae on the glass

Used to test and monitor the concentrate of the aquarium water fish for tank