The Medco Light Duty Ranger Mobile Universal Trailer Tester is the perfect tool for testing and troubleshooting trailer wiring systems. This tester is water resistant and features short circuit protection for added safety. It comes with a 3-way trailer adapter and a battery charger, making it easy to use and reliable. With its lightweight and portable design, you can take it anywhere. It is the perfect tool for any trailer wiring job. FleetPride is your First Click in Heavy Duty®.