Our tester can quickly detect whether your relay is normal. It is easy to use, suitable for general-purpose automotive relays on the market. When testing, it needs to be connected to the car's 11V-15V battery. Note: 1. The car battery must be a 12V battery and the battery voltage must be between 11V-15V; 2. The applicable coil resistance is preferably above 20 ohms. | Test to properly control the opening and closing of the relay. | Operating Instructions：First, clip the tester’s alligator clip to the car battery: the black clip on the negative pole, and the red clip on the positive pole. When the red LED light is on, it means the tester can start the test. Check the relay before testing. Select the appropriate socket according to the pins, insert the relay into sockets, press the "Test" button, and the tester will automatically detect the pin position of the unknown relay. | When the relay is not a general-purpose relay on the market or the relay is damaged, it will turn on the red LED. When the pin setting is correct, the tester will open and close 10 times to detect the release time of the action. When the detection time is too long, the tester will light up the red LED light. | With its small size, compact structure, and being easy to carry, you can test anywhere you want. If you have any questions about our product, please contact to us by email and we will help you. Package includes: 1* Relay Tester