Description : Water Flow sensor includes a plastic body housing, a water rotor, and a hall-effect sensor, PCB electronics board Working performance : When the water flows through the rotor, then rotor is rolled Its speed changes with different rate of flow. Then the magnetic rotor make reaction to Hall sensor, the hall-effect sensor outputs the corresponding pulse signal The flow sensor is suitable to detect the flow in water dispenser or coffee machine ..... Specification: Material : Plastic Color: White Function: Sensor, flow rate control Flow Rate: 0.3~3 L/min Flow Pulse: F(Hz)=(109xQ) L/min +/- 5 % Max. Working Current : 15mA (DC5 V) Min. Working Voltage: for DC 4.5V Working Voltage: for DC 5V~24V Load Capacity: =10 mA (for DC 5 V) Pressure: 0.8mPa Operating Working Temperature : -25~+60 1 Litter water =7055Pulse +/-10% Accuracy :+- 5% Working environmental: Water, liquid, light oil, beer, drinking water Connect Pipe Diameter: 6mm or 1/4" Inner Diameter: 58.4mm/0.23" Outer Diameter: 12.2mm/0.48" Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 Pc x Water Flow Sensor