Car Relay Tester 4 Pin 5 Pin Automotive Relay Tester 12V Car Battery and Alternator Checker Tester Analyzer Diagnostic Tool Features:This tester is designed to test the condition of your car relay.Test to properly control the opening and closing of the relay.If the relay is abnormal the red LED will light, it's normal the green LED will light.Provides a convenient and intuitive diagnostic way, time-saving and economical.Small size, compact structure, easy to carry, you can test anywhere as you want. Note: Car battery must be 12V battery, the voltage must be between 11-15V. The coil resistance is preferably at least 20 ohms Specification:Voltage: 12VMaterial: Plastic & MetalItem Size: 12 * 6 * 2.5cm