Frequency: HZ = (6*Q-2)* Q =(L / Min) voltage output of the premium: 3.5-24VDC a liter of water flow after pulse output 358 Flow range: 2-60L/min Inner diameter/Outer diameter: 20mm/32.7mm Screw length: 13mm It can be used for:Apply to food, credit card machines, water vending machines, and other flow measurement devices Lowest rated operating voltage: DC4.5 The maximum operating current: 15 mA (DC 5V) Operating voltage range: DC 5 ~ 24 V Load capacity: Less than or equal to10 mA (DC 5V) Operating temperature range: Less than or equal to80 Operating humidity: 35% ~ 90% RH (no condensation state) Allow pressure less pressure: 1.75Mpa Storage temperature: -25 ~ + 80 Storage humidity: 25% ~ 95% RH Colour:Black Material:ABS Package Contents: 1 x DN25 Water Flow Sensor 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.