9milelake Fuel Gasoline Diesel Petrol Oil Nozzle Digital Flow Meter Fuel Delivery Gun Suitable for Fuel ,Gasoline, Kerosene Diesel ,Petrol and so on . Accuracy (% of Reading):  0.5% , Max. working pressure :0.2Mpa, Mesuring scale :9999.9, this flow meter has circle function ,when it mass this scale ,it will start from the zero again -Two main Button: CALIBRATE from which you can choose the right measuring unite you need and diplay the total volume AND DISPLAY from which you can change the PER TIME volume to be zero Liters(L) / Gallons(GAL) / Pints(PT) / Quarts(QT). The battery inside can supply 9000hours operation approxmately. Max. working pressure :0.2Mpa, Operating Temperature Range: -10C to +60C . It can be used with 24V transfer pump.