1Motor oil tester has high level of accuracy and sensitivity, with calibration function, detection results are precise. 2Oil quality inspection to ensure oil safety, allows you say goodbye to substandard and counterfeit lubricants. 3With LED indicator function, you can clearly figure out the state of oil quality, the last light indicates the quality of the lubricant. 4Mainly aimed primarily at increasing the acidity of lubricating oil, providing you with a lot of convenience. 5Suitable for detect diesel engine oil, gasoline engine oil, by testing the oil acid, carbon deposition and moisture, other impurities. Item Type: Oil Tester Material: ABS Color: Red Size: Approx. 53 x 83 x 13mm/2.1 x 3.3 x 0.5in Working Temperature: 15-27 Test Type: Engine Oil Battery Type: Button Battery Battery Model: CR2032 Battery Capacity: 240mAh Battery Voltage: 3.0V Purpose: Suitable for Oil Quality Detection 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. 1 x Detector 2 x Battery 1 x Manual If the test results show that red LED No. 10 flashes, it usually indicates that the lubricating oil has reached an acceptable lower level. At this time, the lubricating oil needs to be replaced.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.