Tube diameter: 1"; Water pressure: <1.75Mpa; Working voltage range: DC 5~24V; Insulation resistance: >100mohm; Accuracy: 1～60L/MIN ±3%; Flow pulse number: 4.8 x Q (Q is L/Min); Low temperature test: After storing in -20'C temperature for 72 hours and in room temperature for 1 hour, the accuracy is within ±5% comparing with the firs measurement; High temperature test: After storing in 85'C temperature for 72 hours and in room temperature for 1 hour, the accuracy is within ±3% comparing with the firs measurement.