Features: The Water Flow Meter is a compact and easy to install meter. Its versatile designs allows for compatibility with various output modules, sensors, and remote transmitters. Designed for professionals and individuals alike, the Flow Meter is perfect for anyone who needs to accurately measure liquid flow rates. For use in various applications such as water heaters, water dispensers and more. Its compact size and easy installation make it suitable for a wide of applications. The water flow sensor is mainly composed of stainless body, water flow rotor assembly and Hall sensor installed in the water heater end, used to detect the flow, when the water through the water flow rotor assembly, the magnetic rotor rotate and speed changes with flow, Hall sensor output the corresponding pulse signal, feedback to controller, controller determines the size of the water flow for regulation. Specifications: Material: Stainless Steel Connector: (DN20) Voltage: 3.5-24VDC Thread Length: 11mm Water Pressure Resistance: Less Equal to 1.75MPa High Level Output Pulse: Large Than DC4.5V(Input DC5V) Low Level Output Pulse: Lower Than DC0.5V(Input DC5V) Output Pulse Duty Ratio: 50%±10% Insulation Resistance: Large Than 100MΩ Flow Range: 1-30L/Min±3% Pulse Characteristics: Hz=[15xQ-3]±5% (Q＝L/min)(Horizontal Testing) Wiring Method: RED IN to Positive, YELLOW OUT to Signal Output, Black to Negative Size: Approx. 25.8x50mm/1.02x1.97in Package Includes: 1x Flow Sensor note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.