DIGITEN G1/2" Water Flow Control LCD Display+G1/2" Flow Sensor Meter+G1/2" Electric Switch Solenoid Valve Gauge Flow range:1-30L/min Monitor real-time flow rate. Control quantitative flow.when flow reach to the presetting flow,system will output signal to?solenoid valve(ON/OFF). Monitor total flow number Set K constant for accuracy of flowmeters.