Fast Check -- The 7 pin light electrics diagnostic tool tester is designed to indicate a failure in the wiring circuits on both towing vehicles and trailers promptly. Easy to Assemble -- This 12v brake light tester is easy to operate. One side connects to 7pin plug and the other side to 7-pin socket ( only for testing 7pin without adapter) Premium Quality -- These electric wiring testers are selected with superior plastic and cross slotted copper, which naturally match with the female pin. Extensively Use -- The 7 way trailer plug tester set 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).
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