Function: 1. The engine oil tester has a high level of accuracy and sensitivity, with calibration function, the detection results are precise. 2. Oil quality control to ensure oil safety, say goodbye to substandard and counterfeit lubricants. 3. With the function of LED indicator, you can clearly tell the oil quality status, the last light indicates the quality of the lubricant. 4. Mainly aimed primarily at increasing the acidity of the lubricating oil, providing great convenience. 5. Suitable for detecting diesel engine oil, gasoline engine oil, by testing oil acid, carbon and moisture deposition, other impurities. Specification: Item Type: Oil Tester Material : ABS Red color 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 the key down. Wait 5 seconds, then pour oil into the test tank when the green light flashes on the instrument and the red light flashes. Finally press the test key to start the test 2. Add a few drops of the lubricating oil to be tested to the instrument sensor. Don't miss the test tank. 3. Press the "test" test button and release it quickly. The 10 lights will flash sequentially. The last light indicates the quality of the lubricant. 4. NO. 1-7 Any LED blinks green to indicate good oil quality. LED No. 8 or No. 9 is flashing yellow and the oil quality is average. LED No. 10 flashes red slowly. It is recommended to change the lubricating oil. LED No. 10 flashes red quickly, it is recommended to test the motor. Package List: 1 x detector 2 batteries 1 x Manual Note: If the test results indicate that the red LED #10 is flashing, this usually means that the lubricating oil has reached an acceptable lower level. The lubricating oil should be changed at this time.