Product introduction: Durable material: The car battery tester is made of plastic and metal, strong and practical, fine workmanship and good performance, durable for a long time. Provides a convenient and intuitive way to diagnose, saves time and is economical. Uses 12V power supply: The car battery must be a 12V battery, and the battery voltage is between 11V and 15V. Ideal for coil resistance greater than 20 ohms. Test to correctly control the opening and closing of the relay Easy to use: Small size and compact structure, easy to carry and use. You can try anywhere you want. If the relay is abnormal, the red LED will light up, it is normal for the green LED to light up Wide application: The tester observes the contact data, closing time, relay inertia at each test step, etc. Quick and easy car relay test provides a convenient and intuitive way to diagnose. This tester is designed to test the status of your car relay Description: This is a quick test tool for testing automotive