• Quick off-vehicle relay tester to check the coil and switch contacts. • Automatic test with LED indicators: green light for normal status and red light for defective components. • Adjustable and compatible with 4 and 5-pin relays, the most common in automotive applications. • Uses the vehicle's 12V battery as a power source (range from 11V to 15V). • Applicable to relays with a coil resistance greater than 20 ohms. • Made of high-quality ABS material, lightweight, wear-resistant, and corrosion-resistant. • Useful for diagnosing lights, wipers, starter motors, air conditioning, and audio systems. • Compact and portable design that allows for quick testing at any time.