The trailer lighting tester is the ideal test device for quickly checking the lighting system on trailers, caravans and towing vehicles with a 12V connection. It is suitable for both 7-pin and 13-pin plugs and sockets. The integrated LED display shows the function of the respective cable in color. The tester reliably checks both the vehicle socket and the trailer plug. It is powered by a 9V block battery (not included). https://elecena.pl/product/29518610/trailer-lighting-tester-led-display-for-12-v 2025-11-18 https://elecena.pl/product/29518610/trailer-lighting-tester-led-display-for-12-v 2026-02-11