AOHEWEI 7 Pin Trailer Plug Tester Socket Light Connector Wiring Circuit Diagnostic Testing Tools with 13 Towing Adapter for Caravan Truck or

Fast Check -- The 7 pin trailer light tester is designed to indicate a failure in the wiring circuits on both towing vehicles and trailers promptly. Easy to Assemble -- 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. Premium Quality -- Those electric wiring testers are selected with superior plastic and cross slotted copper, which naturally match with the female pin. Extensively Use -- The 7 way wiring circuit diagnostic tool is normal European standard. It can be widely used to car, caravan, RV, or any other commercial vehicle freely. Kindly Reminder -- The trailer circuit tester requires 1pc 9V battery (not included).