Features: 1.Suitable 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. 2.4 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. 3.Easy to clean, install and maintain. Maximum measurement scale 9999.9, when it reaches this scale, it will start from zero again. 4.Flow meter adopts high?pressure casting process to reduce the generation of bubbles and static electricity. 5.Electronic metering and precise flow control capabilities can ensure that customers accurately control the flow. Humanized design, professional quality, simple operation and durable. Specification: 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: Press"CALIBRATE" and hold for 10 seconds, press "DISPLAY" or "CALIBRATE" for adjusting. 4.Units Switch: Press"CALIBRATE" 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).