Check the listing for details. Pro Tool Vehicle Trailer Wiring 7-Way Circuit Tester 6 Function LED Indicators. Condition: New. Listed at 8.98 USD. This Pro Tool circuit tester is an essential tool for anyone working with vehicle or trailer wiring. With 6 function LED indicators, you can easily test the wiring of your vehicle without worrying about the condition of the tester. It is specifically designed for 7-way circuits and is compatible with both vehicles and trailers. The Pro Tool brand is known for its quality and reliability, ensuring that you can trust this tool to get the job done. This circuit tester is a must-have for any DIYer or professional mechanic. Its compact size and easy-to-use design make it perfect for on-the-go testing. The model, Pro, is specifically designed for this type of tool and ensures that you are getting the best quality product available. With its precise measurements and clear LED indicators, you can test your wiring with confidence.