真鍮流量センサー, convenient installation, waterproof explosion-proof, Heat resistance and cold resistance.the pulse signal output, Can be used for water flow switch, also can be used to measure the flow, Water flow meter for shower room credit card system.have two flow range.If you want to increase the temperature control ,you can add heat sensitive resistor, the output line is green, but also can be connected to the other two special line to control temperature.