Product Description: CO2 regulator by Milwaukee Instruments includes solenoid valve and bubble counter. Unit comes with dual gauges each with dual reading of both psi & kg/cm. Left gauge meters tank capacity and right gauge meters flow. Needle valve flow control provides for precise measurement. The solenoid valve comes with a 1.5 meter power cord. (CO2 bottle is not included). Recommended to be used with our pH controller Model SMS122