Best Regulators Co2s

100% brand new and high quality Features: 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. A wonderful solution for feeding fish and observing their living condition. 1 pc of solution only,other accessories demo in the picture are not included! Specification: Type: Liquid Color: As pictures shown Size: One Size Height: 7.7cm(3.03in) Net Weight: 15ml Quantity: 1 Pc Note:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(without retail package): 1 x CO2 indicator Solution