As people increasingly value engine protection and prioritize driving safety, engine lubricant testing has gained significant attention in the realm of automotive service. The AS503 Engine Oil Tester is a oil testing device tailored for the automotive inspection and maintenance sector. Its primary function involves measuring the transparency of engine oil within gasoline or engines. This measurement reflects the presence of impurities and contaminants within the oil. AS503 Engine Oil Tester Features: [Optical Principle Precision Test]Auto Oil Quality Check,The 2.8 Inchs LED display can accurately display the results and the readings are clearer.Use the optical principle to check the engine oil condition,with a clear display for efficient operation even in varying lighting conditions,be it bright daylight or dim nighttime.Use the optical principle to check the engine oil condition and get the latest oil condition in anytime and anywhere.get the latest oil condition in anytime and anywhere. [Sound Alarm]when the transmittance is between 100% and 50%,there is no need to change engin oil.when the transmittance is between 50% and 30%,an exclamation mark be displayed on the screen to remind you to change the engin oil. when it isbelow 30%.the engin oil tester emit a "beep"alarm to remind you to change the engin oil immediately to safety.[ T] to indicate the current oil measurement temperature. Operation steps: 1.wipe the test probe clean 2.remove the oil 3. the ↶ button to select the vehicle's engine type 4.submerge the testing probe into the engine oil 5. the ►buteon to start the test 6.the interface display the test results Colour:AS SHOWN Material:ABS+METAL Package Contents: 1PCS Car Engine Oil Tester with Digital Display Only the above package content, other products are not included. Note: Light reflection 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.