Specifications: Frequency: F=4.8 * Q (L / Min) error:2%, current can not exceed 10mA, 450 output pulses/liters. F=onstant * units of flow (L / min) * time (seconds). Flow range:1-60L/min Maximum current:10 mA(DC 5V) Working voltage range:DC 5-18 V Load capacity: ≤10 mA(DC 5V) Operating Temp: ≤80℃,Operating humidity:35%-90%RH Allow compression:Water pressure 1.2 Mpa below Insulation resistance:>100M OHM Storage Temperature:-25℃-80℃ Storage humidity:25%-95%RH Output Waveform:Square Wave,output pulse signal. Cable length:15cm. Package include: Flowmeter x 1