Aquarium CO2 Monitor Carbon Dioxide Glass Drop Checker with 15 ml Monitor Fluid.
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, excessive CO2 may cause fish and shrimp to die of oxygen deficiency.
Concealed glass groove is easy to open and fill into liquid.
Packaged with monitor liquids, which can be directly dropped into and use.
Suitable For: Long-term CO2 monitoring
Size: 115x115x40mm / 4.53x4.53x1.57inch