1. Continuously powers the relay coil via the automobile battery to properly check the relay contact function. 2. The tester allows observation of contact data, closure time, and relay operation at each test stage. 3. Enables accurate control of relay opening and closing during testing. 4. Features a red LED to indicate abnormal relay performance and a green LED for normal operation. 5. Well-built with reliable performance. 6. Simple to operate. 7. Compact and portable design. 8. Designed for practical use. Most car systems such as lights, wipers, air conditioners, electric seats, power doors, anti-lock brakes, and audio systems use relays. Automotive relays are exposed to vibration, high and low temperatures, and humidity, which can reduce their lifespan. If a relay fails, it may cause system failure or render the vehicle inoperable. Regular relay inspection is essential. This tester checks relay contact functionality by connecting the car battery (11V–15V) to the relay coil. Color: Black & Red Material: Plastic Package Contents: 1 x Car Relay Tester Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.