100% brand new and high quality Features: Product name: water flow sensor for water purifier Product application: fruit and vegetable cultivation, beer machine, dishwasher, water purifier, wine vending machine, wine cabinet, etc.Equipment to be measured. Small/micro, high-precision, ultra-small flow start/ultra-high resolution, food-grade certification, easy installation, adjustable angle, diverse models, anti-backflow, durable and reliable, long life, low power consumption (using low-power chips ), patented products, high-tech products, high 1.2MPa water pressure resistance, water hammer resistance, long service life, quiet operation, hygiene and safety, low voltage operation Hall principle: magnetic excitation, high and low level, pulse signal, square wave signal, duty cycle 50%, linear ratio, digital signal Function: metering, speed counting, start signal, alarm signal, water shortage protection Specific parameters: A and B Accuracy (flow): 0.2-8L/MIN within 5% Maximum working current: 15MA (DC5v) Load capacity: 10MA (DC5v) Humidity range: 35%-90RH (no frosting state) Storage temperature: -25~+80 Output pulse high voltage: >4.7V Minimum working voltage: 3.5V Temperature range: 80 Allowable pressure: under 1.75mpa water pressure Working voltage range: DC3.5-20v Storage humidity: 25%-95%RH Output pulse low voltage: less than DC5.0v C and D Accuracy (flow): within 0.3-10L/MIN 5% Maximum working current: 15MA (DC5v) Load capacity: 10MA (DC5v) Humidity range: 35%-90RH (no frosting state) Humidity range: -25~+80 Output pulse high voltage: >4.7V Minimum working voltage: 3.5V Temperature range: 80 Allowable pressure: under 1.75mpa water pressure Working voltage range: DC3.5-20v Storage humidity: 25%-95%RH Output pulse low voltage: less than DC5.0v E and F Accuracy (flow): within 0.2-8L/MIN 5% OR within 0.1-2L/MIN 5% Maximum working current: 15MA (DC5v) Load capacity: 10MA (DC5v) Humidity range: 35%-90RH (no frosting state) Humidity range: -25~+80 Output pulse high voltage: >4.7V Minimum working voltage: 3.5V Temperature range: 80 Allowable pressure: under 1.75mpa water pressure Working voltage range: DC3.5-20v Storage humidity: 25%-95%RH Output pulse low voltage: less than DC5.0v Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1xWater Flow Sensor