Description: Accurately adjust the number of bubbles: thanks to the integrated fine needle valve, you have full control over the amount of CO2. The included high-quality bubble counter allows you to regulate according to the number of bubbles per minute. Thus, the plants can be optimally supplied with CO2 and grow magnificently. Monitor: With the two precise high-performance pressure gauges, the CO2 pressure in the bottle and on the output can be easily and safely monitored. The bottle pressure indicates when the CO2 is used up. This means that the next filling can be optimally planned and a CO2 free time can be avoided. The pressure on the outlet is used to check the optimal stream rate into the aquarium. Specification: Color: silver. Material: ABS. Size: Approx 11 cm *6 cm *3 cm/4.33*2.36*1.18inch. Note: There might be a bit color distortions due to different resolutions. There might be a slight errors due to different hand measurement. Package Includes: A Pressure Gage