AUTOOL AS503 Engine Oil Tester with Digital Display

The AUTOOL AS503 is a handheld engine oil tester for gasoline and diesel vehicles. It uses optical probe technology to check engine oil transmittance and oil temperature, helping users evaluate oil contamination, oil quality, and replacement timing during automotive inspection and maintenance. AS503 is designed for engine lubricating oil quality checks based on light transmission. Review the oil type limitation, engine limitation, test interval, and probe handling notes before ordering or using the tester. AS503 combines optical oil transmittance detection, oil temperature measurement, gasoline and diesel mode selection, a flexible PTFE probe hose, a backlit LCD, sound reminders, and a handheld body for quick engine oil checks. Engine oil supports lubrication, cooling, rust prevention, cleaning, sealing, and buffering. AS503 gives a fast reference reading by checking oil transmittance and oil temperature, helping users decide when oil maintenance may be needed. Use the AS503 probe directly with engine oil, select the correct gasoline or diesel mode, and read the transmittance and oil temperature result after the test starts. Key features • Oil Clarity Check: Measures engine oil transparency to spot impurities and contamination. • Temp Sensor: Built-in temperature sensing adds context to the result. • Precision Readout: Designed for accurate maintenance testing on gasoline or diesel engines. • Product: AUTOOL AS503 Engine Oil Quality Tester • Detection Technology: Optical probe technology • Operating Principle: Engine oil transmittance