Material: Made of plastic and metal material,fine workmanship,good performance,durable,convenient.<br>Working Principle: Through connect continuous automobile battery voltage(11V-15V) to the relay coil, the detector can properly check the relay contact function.<br>LED Indicator Light: If red LED will light,the relay is abnormal.If green LED will light,the relay is normal.<br>Design: Compact design,light weight,small size,portable,easy to carry and use, work accurately,perfect choice for you.<br>Applications: Test to properly control the opening and closing of the relay.<br>Specification:<br>Material: plastic and metal,fine workmanship,durable.<br>Color: black and red<br>Voltage: 12V<br>Size: 11x 6x2.8cm/4.3x2.4x1.1inch(Due to manual measurement, there will be an error of 1-3mm)<br>Feature:<br>Working Principle: Through connect continuous automobile battery voltage (11V-15V) to the relay coil, the detector can properly check the relay contact function.<br>LED Indicator Light: If red LED will light,the relay is abnormal.If green LED will light,the relay is normal.It's easy to detect, so you can know what's wrong.<br>Applications: Test to properly control the opening and closing of the relay. A test tool to automotive relays.<br>Design: Compact design,light weight,small size,work accurately,perfect choice for you.<br>The tester observes contact data, closure time, relay inertia at each test stage.<br>Package List:<br>1 x relay tester<br>Note:<br>Car battery must be 12V battery, the voltage must be between 11-15V. The coil resistance is preferably at least 20 ohms.<br>