DESCRIPTION: Waterproof, heat resistance, pressure resistance, cold resistance Easy to install Frequency: F=4.8 * Q (L / Min) error: ± 2% voltage: 3.5-24VDC, current can not exceed 10mA, 450 output pulses/liters, F=constant * units of flow (L / min) * time (seconds). Flow range: 1-60L/min Maximum current: 15 mA (DC 5V) Working voltage range: DC 5～24 V Load capacity:≤10 mA(DC 5V) Operating Temp:≤80℃,Operating humidity:35%～90%RH Allow compression: Water pressure >1.75Mpa Insulation resistance: >100M OHM Storage Temperature:-25～+80℃ Storage humidity:25%～95%RH Output Waveform: Square Wave, output pulse signal ROHS Compliant Material: ABS Plastic Color: Black Cable length: approx. 15cm INCLUDED: 1 x Flow Meter

Funcionamiento en el arduino: http://diyhacking.com/arduino-flow-rate-sensor/