The Medco Tool 7-Round Pin Smart Mobile Universal Trailer Tester is the perfect tool for quickly and accurately diagnosing trailer wiring problems. This tester features an LED display that provides clear, easy-to-read diagnostic information. It has a portable design makes it easy to transport and use in different locations. The tester also includes a built-in circuit tester that helps quickly identify wiring problems and faults. With its easy-to-use design and reliable performance, it is the perfect tool for any trailer wiring job. FleetPride is your First Click in Heavy Duty®.