Wide range of applications: The tester will observe the contact data, closing time, relay inertia, etc. of each test phase. The quick and easy test of the offboard relay provides a convenient and intuitive diagnosis method. This tester is designed to test the condition of your car relay. Easy to use: small size, compact structure, easy to carry and use. You can test it anywhere. If the relay is abnormal, the red LED will light up, which is normal, and the green LED will light up. Use 12V power supply: The car battery must be a 12V battery, and the battery voltage is between 11V15V. Ideal for coil resistance over 20 ohms. Test to properly control the opening and closing of the relay. Quick test tool: It can be set to 4pin and 5pin relaystest the 3 most popular automotive relays, through the continuous car battery (11V15V) to the relay coil, the detector can correctly check the contact function of the relay . Durable materials: The auto battery checker is made of plastic and metal materials, strong and practical, fine workmanship, good performance, and durable. Provides a convenient and intuitive diagnosis method, which is timesaving and economical. Weight: 243g color: red Material: insulating material Quantity: 1pcs Packing list: 1*relay testing instrument (insert card) Only the above package contents are included, other products are not included. Note: Reflection of light and different monitors may cause the item's color to be slightly different from the actual item. Measurements allow +/- 1-3 cm.