Feature 1Comes with calibration function, detection accuracy is higher. 2Prevent misuse of all kinds of unqualified and fake lubricating oil. 3Oil quality inspection to ensure oil safety. Features: Comes with calibration function, detection accuracy is higher. Prevent misuse of all kinds of unqualified and fake lubricating oil. Oil quality inspection to ensure oil safety. Detection of diesel engine oil, gasoline engine oil, by testing the oil acid, carbon deposition and moisture, other impurities. The equipment is small and easy to carry. Specifications: Material: ABS Color: Red/Black for optional Testing system: oil quality Power Supply: 2x 3V CR2032 button batteryinclude Package weight: 75g Package size: 12*5*5cm / 4.72*1.97*1.97in Operation instructions: 1.Select engine type GAS or DSL(diesel).Turn on key down. Wait for 5 seconds, and then drip oil to the test tank when the green light is flashing on the instrument and the red light is flashing. Finally, press the test key to start the test 2. Add a few drops of lubricating oil to be tested to the sensor of the instrument. Do not miss the test tank. 3.Press the "test" test key and release it quickly. The 10 lights will flash in sequence. The last light indicates the quality of the lubricant. 4.No. 1-7 Any LED flashes green, indicating good oil quality. No.8 or No.9 led flickers yellow, and the oil quality is average. No. 10 LED is flashing red slowly. It is recommended to change lubricating oil. No. 10 LED flashes red rapidly, it is recommended to test the engine. Package list: 1 X Engine Oil Quality Detector Package List 1 X Engine Oil Quality Detector