Feature: 1. EASY TO INSTALL: Hall flow sensor is light weight, small size, provide simple installation, easy to carry and use 2. WATERPROOF AND WEAR RESISTANT: Hall component adopt waterproof design to prevent water ingress, good quality material is inlaid inside the impeller, durable and wear resistant 3. THREE WIRE CONNECTION: Red is positive, black is negative, yellow is pulse signal, different color is clear for you to distinguish 4. WATER FLOW SWITCH: The water flow sensor is applied to the water heater and can be used as a flow switch, useful and practical 5. IMPACT STRENGTH POM: Made of good quality POM material, has good fatigue resistance and impact strength, good creep resistance Specification: Item Type: Hall Flow Sensor Material: POM Interface Size: G3/8 pipe Inner Diameter: Approx. 5mm / 0.2in, Outer Diameter: Approx. 9.5mm / 0.37in Flow Range: 0.3-10L/min Pulse Frequency: F=(10xQ)±5% Maximum Operating Current: 15mA (DC5V) Operating Temperature Range: ≤80℃. Package List: 1 x Hall Flow Sensor Note: 1. The installation should follow the flow direction on the back of the product, otherwise there will be no signal output.2. A filter must be installed at the entrance of the sensor to prevent particles and debris from entering the sensor.