Features: 1Suitable for use in factories, car yards, gas stations and household range Soods. It is widely used in the fuel management of highway construction, industrial enterprises, government agencies and organizations. 24 unit options, liter (L) / gallon (GAL) / pint (PT) / quart (QT), used in different countries. The fueling gun has a unit automatic locking function and works with the fuel pump, which is highly efficient. 3Easy to clean, install and maintain. Maximum measurement scale 9999.9, when it reaches this scale, it will start from zero again. 4Flow meter adopts high?pressure casting process to reduce the generation of bubbles and static electricity. 5Electronic metering and precise flow control capabilities can ensure that customers accurately control the flow. Humanized design, professional quality, simple operation and durable. Item Type: Flow Meter Material: Aluminum alloy, cast iron and high strength plastics Standard: 1 Set (one adapter for delivery) Rated Flow: 0 - 60L/min Accuracy: 1% Working Pressure: 0.03Mpa Operating Temperature Range: -10 - 55 Battery: 2 x AAA batteries,150 mAh (matched shipment) Operation: 1.Reset to 0: Press DISPLAY for 1 second reset to zero. 2.Cumulative Total: Press CALIBRATE indicating the cumulative total fueling. When the cumulative total reaches a maximum reading 9999,9, it will automatically reset to zero. 3.Calibrate Adjusting: PressCALIBRATE and hold for 10 seconds, press DISPLAY or CALIBRATE for adjusting. 4.Units Switch: PressCALIBRATE and hold for 5 seconds, press DISPLAY move to the last one. Then press CALIBRATE to choose units switch among Liters(L) / Gallons(GAL) / Pints(PT) / Quarts(QT). 1 x Flow Meter 1 x Adapter 1 x&nbspManual