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Descriptions:1. The Water Flow Sensor is light, nimble outline, small size and easy to install. The bearings used in the rotating part. All materials are in line with ROHS testing standards.2. There is an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.3. Three wire connection: Red for positive, black for negative, yellow for pulse signal. Specifications:Product Name: Water Flow SensorMaterial: Nylon and Glass Fiber(Shell)Structure: StraightLiquid Temperature: Not More Than 60CWorking Voltage Range: DC 4.5V~18VRated Voltage: DC 5VMax Current: 15mA(DC 5V)Maximum water pressure: 1.75MPaFlow range:1-30L/minConnector: Male XH-3P PlugCable Length: 35cmSize: 66mm x 50mm x 37mm(L*W*H)Male Thread Size: G1/2 inchColor: BlackNet Weight: 67g Package Included:1 x Water Flow Sensor