12V 13-Pin Trailer Tester. This tester quickly identifies faults in the wiring circuit of a towing vehicle or trailer. Suitable for caravans, tractors, trailers, trucks, boats, cars, and motorhomes. User warnings: - Do not connect the tester to both the trailer and the vehicle simultaneously. - Use only as intended. - The device is designed to test the 13-pin trailer connector on one side and the 13-pin towing vehicle connector on the other. Requires one 9V battery (not included).
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