Engine Oil Analysis Kit: Insert the probe into the oil tank to check transmittance directly reveals oil impurities/contaminants for quick quality performance check. Built-in high-precision temp sensor with an operating temperature (-10℃-60℃), reflecting engine working status and load accurately Dual Test Modes for Versatile Use: Choose between gasoline or diesel engine mode to fit diverse testing needs. This oil quality tester works with most gasoline/diesel engine lubricants on the market, supporting separate sampling and measurement for precise oil condition assessment Premium Teflon Hose & High-Precision Probe: 800 mm (31.5 in) oil/oxidation/corrosion-resistant Teflon hose boosts testing flexibility and durability. The probe features a photoelectric transceiver sensor for ultra-accurate, reliable measurement results every time Backlit Screen & Ergonomic Design: 2.8-inch LCD backlit display ensures clear result visibility in bright sunlight or dark garages, streamlining testing work. Silicone-grip handheld design delivers a comfortable, stable hold for effortless one-handed operation Battery-Powered & Auto-Shutoff for Power Saving: Runs on 4×1.5V AAA batteries (included); check real-time battery level via the top-left screen icon. Auto-shuts off after 5 mins of inactivity to extend battery life and reduce waste Important Tips for Accurate Testing: Keep the flexible tube straight when adjusting its angle; always test with a fully cooled engine to ensure precise, reliable measurement data This engine oil quality tester is used to detect the deterioration of engine oil, which can cause serious damage to the engine. If the degree of deterioration of the engine oil is serious, the oil light will turn red. If the degree of deterioration of the engine oil is serious, the oil light will turn red. The tester is small and easy to operate. The tester is small and easy to operate. It is an ideal tool for car owners to check the engine oil quality.