Origin:Mainland China Item Type:Trailer Couplings & Accessories Feature Use To------The Circuit Light Test is an extremely useful product when there is an urgent need of checking the configuration of the tow circuit of the vehicle. The product comes handy at the time when the need of checking the circuits configuration arises. Good Performance-----Used to test whether the trailer power supply wiring is normal. With 6 LED indicators for easy observation. Fine Workmanship-----Lightweight and portable, easy to operate, worthy of your trust.Trailer tester for 7-pin plug and socket connection. Specification Material: copper+ABS Color: black Scope of application: 7-pin trailer plug socket connector (N type) test Pakage include 1* Trailer Socket Tester ( 9V battery is not included)