Trailer Tester 12V 13pin Tow Bar Light Plug Socket Wiring Test Diagnostic Tool Resistance Test Fault

1. Trailer Tester: This tester has one side to connect the 13 pins plug of a trailer and another side to connect the socket of a car, makes it convenient to use.2. Main Function: This trailer plug tester can help you to quickly check the circuit failure of both vehicles and the electrical system on