1. VERSATILE COMPATIBILITY This 12V 13pin trailer wiring circuit tester is designed to work seamlessly with a wide range of vehicles including trailers, caravans, horseboxes and carriers. Its universal design ensures it meets various towing needs, making it an essential tool for anyone who regularly tows different types of loads. The tester provides comprehensive diagnostics for all standard trailer lighting systems. 2. EASY TO USE DIAGNOSTICS Simply connect one end to your trailer's plug and the other to your towing vehicle's socket for instant troubleshooting. Our intuitive design allows even beginners to quickly identify wiring issues with clear indications for each circuit. The straightforward operation saves you time and frustration when diagnosing trailer light problems before hitting the road. 3. COMPREHENSIVE FAULT DETECTION Our advanced circuit tester rapidly identifies wiring defects in both trailers and towing vehicles. It pinpoints issues with brake lights, turn signals, tail lights and other essential circuits with precision. The bright LED indicators provide clear visual feedback about any wiring faults, helping you resolve problems quickly and safely. 4. DURABLE CONSTRUCTION Built with quality ABS housing and copper contacts, this tester withstands rugged towing conditions. The robust design ensures reliable performance in all weather conditions, while the compact size makes it easy to store in your vehicle. Professionalgrade materials guarantee longlasting durability, trip after trip.