Specification: Function: Sensor , flow rate control Flow rate (test by oil high density liquid) : 30-3000L/Hour Flow Pulse: F(Hz)=1.2ML/ P +/-1% Working Voltage:DC 7V~24V not less than 5Vdc Working Load Capacity: =10 mA (DC 5 V) Operate pressure: Less than 1.2Mpa Operating Working Temperature: -25 Degree centigrade to +70 Degree centigrade Liquid Temperature: 70 Accuracy: at 30-3000L/hour is +/-1%, test liquid is diesel. Working environmental: liquid, light oil, diesel .... Cable wire: Red: + IN , Black: - GND , Yellow: signal output. Color: As Shown Material: plastic Package Contents: 3 x Gear flow meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.