With the 70226-2 you can check comprehensively, quickly and reliably the trailer socket on the towing vehicle as well as the lighting on the trailer.How to test the towing vehicle Connect the appliance to a 12 V trailer socket and check all the functions of 13 and 7-pin sockets. The test device 70226-2 impresses through a fault simulation of the indicators (left and right) and completely new: Test whether the vehicle is compatible with trailers with LED lighting. To test the trailer using a push button on the high-quality membrane keyboard, you can switch on each individual lighting function on the trailer. No matter whether LED-lighting or conventional bulbs. The integrated LED display simultaneously transmits the voltage of the external power source/battery. All this in an extremely robust housing, which cannot touch oil, fuel or other substances. Where you need it, we supply the test device 70226-2 with several cables, so that you can start your test on the spot. This way you can test the trailer and switch on the trailer lighting via the battery cable. With the extra long device cable you can check the trailer socket on the vehicle comfortably from the driver's seatThis text is machine translated.