AUTOOL AS503 2.8 inch Backlit Display Car Engine Oil Tester Lubricating Oil Quality Analyzer 1. Powerful Detection Range: Transmittance Detection measures oil transmittance (0-100%) using optical technology to visualize the level of oil contamination, helping users scientifically determine the oil change cycle. 2. Dual-Mode Adaptation: Supports both gasoline and diesel engine oil testing, compatible with mainstream vehicle models. Switchable Celsius and Fahrenheit units provide real-time oil temperature display, ensuring the engine is within a safe temperature range (below 60°C) during testing. 3. Precision Testing with Sensitive Probe: Testing hose constructed from oil-resistant material resists chemical corrosion and extends service life. 800mm length allows easy access into dipstick tube or oil sump for sampling. High-precision sensors ensure stable signal transmission and accurate light transmission rate measurement without interference. 4. Instant Readout: 2.8-inch high-resolution backlit LCD screen delivers immediate results. Large clear display shows transmittance rate, temperature, oil type, and status indicators such as warning symbols. Easy to read in daylight or low-light conditions, no professional interpretation required. 5. Ergonomic Handheld Design: Body features a silicone-coated grip for comfortable handling, lightweight construction, and one-handed operation. 6. Operating Voltage: 6V 7. Operating Temperature: -10°C to 60°C