EVERGD Trailer Plug Socket Tester 12V 7 Pin Wiring Towing Horsebox Caravan Truck Vehicle Light Connector Circuit Diagnostic Testing Tool with 13 Adapter

7 Pin Trailer Light Tester is designed to indicate a failure in the wiring circuits on both towing vehicles and trailers promptly which is a lighting and cable tester for trailers and towing vehicles. This trailer plug tester is made of high-quality plastic and copper, lightweight and durable, with safe and reliable performance The tester is equipped with 6 LED indicators, which can indicate the wiring failure of the car or trailer. This trailer plug tester is easy to operate. One side connects to 7pin plug and the other side to 7-pin socket, also can be applied to 13 pin with the adapter. Normal European standards, widely used in automobiles, caravans, recreational vehicles and other vehicles It can be used independently to test if the electrics works good or not, install a 9V battery well, then press the yellow button after connected to your tow vehicle, you will see if the vehicle eclectics works good and each light functions good or not.