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Efficient Diagnostics: Quickly identifies wiring circuit failures in towing vehicles and trailers for safer journeys. Durable Construction: Made from durable ABS plastic and cross slotted copper for long-lasting performance and reliability. 12V Compatibility: Designed specifically for 13-pin plugs and sockets, simplifying the testing process with no adapters required. Easy to Use: Plug the tester into the fault plug/socket and press the yellow button to start testing. Operates on a single 9V battery (not included). Universal Application: Perfect for use with cars, caravans, RVs, and other commercial vehicles meeting normal European standards.