7 Way Trailer Light Check Box with Round Pin, Remote Control Function
The trailer light test box works with all kinds of round 7 pin sockets, no need for additional adapters. Easily handles the testing needs of different trailers
The trailer light tester can check the electric brakes and all trailer lighting functions. Reliable for shop or field use, test turn signals, brake lights, tail lights, and reverse lights, accurately checking wiring to ensure your trailer's electrical system is safe and reliable