PhoenixDN Pack of 2 aquarium CO2 monitor, test drop checker aquarium, glass tester, for freshwater aquariums, planted fish tank

CO2 measurement in the aquarium: aquarium tank essential tools. The CO2 content in the aquarium can be determined by changing the colour of the test fluid, which is filled in the long-term test (this product does not contain CO2 indicator). High quality glass material: the CO2 long time instrument is made of high quality glass, crystal clear and sturdy to measure the CO2 content at a glance. Unique round design, very pretty. Strong aquarium suction design: easy to attach to the side wall. The long-term test sticks to the disc thanks to the strong suction cup. Easy to use: the colour of the CO2 indicator is blue. If blue is displayed, CO2 is not enough, turns green, the CO2 balance turns yellow, your tank has too much CO2. Apply to: test and monitor the concentrate of aquarium aquatic plants aquarium. Suitable for aquarium, aquarium, especially aquatic plants, tropical fish to observe and cultivate the aquarium.