MODULAR DESIGN: The modular design makes it suitable for use with output modules, sensors and remote transmitters.HIGH QUALITY: Intuitive clear reading, high reliability, measuring accuracy is +/- 1%. Light weight, compact structure, easy to install.INSTANTANEOUS AND CUMULATIVE FLOW: High-definition displays show both instantaneous and cumulative flow.WIDE APPLICATION : This turbine flow meter can be widely used to measure crude oil, urea, kerosene, gasoline, etc.SPECIFICATION: Thread size: 1inch NPT female; Repetition: +/- 0.5%; Measure accuracy: +/- 1%; Maximum working pressure: 20BAR; Flow range: 15-120L / Min ; Single count: 0.00-9999.9; Total cumulative count: 0-99999 ; Error coefficient: 0.1000-9.9999 ; Unit: L / GAL / PTS / QTS ; Working temperature: -10 Celsius ~ +60 Celsius(14 Fahrenheit~140 Fahrenheit); Operating voltage: 2.3-3.3V ; Application: crude oil, urea, kerosene, gasoline;Battery type: 2 x AAA LRO3 batteries ; Weight: 270g / 9.5ozMalfunction and solution:The flow meter is not accurate. 1. The method of field calibration is not correct. Calibrate again. 2. The flow rate on the meter is below the lowest. Increase the flow rate. 3. The flow meter is blocked by the dry liquid. Take out the impeller and clean it carefully and make sure the impeller turns freely. 4. The impeller is wrapped by the sealing material. Remove the meter and make sure the impeller turns freely. 5. Too close to the impeller. Install properly. 6. Too close to the motor or electronic noise environment Install properly. The reading numbers faded or blanked out. 1.Battery is exhausted or not connected Check the batteries or even replace them. Flow rate is normal but the meter can not count. Press the button of DISPLAY, the meter starts. 1. Field calibration is not correct. Calibrate again. 2. The impeller is blocked or damaged. Remove the meter andmake sure the impeller turns freely. 3.The impeller is wrapped by the sealing material. Remove the meter and make sure the impeller turns freely. Flow rate is low and the meter can not count. Press the button of DISPLAY, the meter starts. 1. The flow meter is blocked by the dry liquid. Take out the impeller, clean it carefully and make sure the impeller turns freely. 2. The flow rate on the meter is below the lowest. Increase the flow rate.Colour: blue + whiteMaterial: plastic + metalPackage Contents:1 * crude oil Fuel Flow MeterOnly the above package content, other products are not included.Note: Light 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.