Features: Water flow sensor is-mainly consists of plastic-valve body, rotor- assembly and hall current sensor. Can use for water heaters, credit card machines, water vending machine, flow measurement device. Inlaid with stainless steel impeller shaft, durable wearable. Seal-ring with the upper and lower force structure never leaks. Mounted vertically, should not exceed 5-degrees inclination.Temperature of Medium should not exceed 120°C. Specifications: Material:Plastic Size:Approx.5.4x2.7x2.8cm/2.12x1.06x1.1inch Package Includes: 1x Water Flow Sensor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.