Features Easy to Install: Hall flow sensor is light weight, small size, provide simple installation, easy to carry and use. Fine Workmanship: Hall component adopt waterproof design to prevent water ingress, good quality material is inlaid inside the impeller, durable and wear resistant. Clear to Distinguish: Red is positive, black is negative, yellow is pulse signal, different color is clear for you to distinguish. Convenient and Practical: The water flow sensor is applied to the water heater and can be used as a flow switch, useful and practical. POM Material: Made of good quality POM material, the water flow sensor has good fatigue resistance and impact strength, good creep resistance. Specification: Item Type: Hall Flow Sensor Material: POM Interface Size: G3/8 pipe Voltage Range: DC3.5-24V Inner Diameter: Approx. 5mm / 0.2in, Outer Diameter: Approx. 9.5mm / 0.37in Flow Range: 0.3-10L/min Pulse Frequency: F=(10xQ)±5% Withstand Voltage: ≤1.75map Output Pulse High Level: ≥DC4.6V (input voltage DC5V) Output Pulse Low Level: ≤DC0.5V (input voltage DC5V) 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. Package List 1 x Hall Flow Sensor