13-pin trailer light tester - Can immediately indicate the failure of the wiring on the tractor and trailer, one side is connected to the 13-pin plug of a trailer and the other side to the 13-pin socket of the towing vehicle. Premium material: Use high-quality plastic and -head copper needles, matched to female needles, with a matt surface and stable connection. Easy to use: plug and play design. Simply plug in the vehicle's plug, press the yellow button on the side of the tester and the LED light will show the diagnostic result. Need a 9V battery (not included) Design: The performance is safe and reliable, the design is reasonable and portable, the appearance is elegant, and it is convenient to use. Even if you're outdoors, you don't have to worry about wasting time testing. Wide use: the 13-pin trailer connector tester is a normal European standard, suitable for cars, caravans, motorhomes, trailers, bicycles, transport vehicles, etc. Material:plastic colour:Black Package Contents: 1 x Trailer Tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.