Description Verify Tractor output, and fully test the lighting system of a pup trailer rear socket. This product is designed to test the output of SAE 7-pole sockets, such as those found on the back of the Tractor and Pup Trailers. The second pup depends on it! LED Indicators quickly identify complete circuits by glowing red. No light means a problem circuit. Constructed of molded PVC for impact resistance. Internally grounded. Solid brass pins/sockets.
