Item Name: Equipment Aquarium Fish Tank Co2 Monitor Tester Aquatic Co2 Monitor Co2 Monitor. Detector size: 4.2*4.2cmColor: transparentShape: note typeMonitoring fluid volume: 15mlMaterial: glassWeight: 20gPackage Include:1set of Aquarium Fish Tank Co2 Monitor TesterFeatures:High quality of materials.Use with CO2 indicator.Easy to use and convenient to detect concentration of CO2.Suitable for all kinds of fish tank.Different color of liquid represents different concentration of CO2.BLUE means that CO2's concentration is too low.GREEN means it is normal.YELLOW means that CO2's concentration is too high so that it is harm to fish. *
