The Innovative Products of America Electric Brake Force Meter with Dynamic Load Simulation and Circuit Testing, No. 9107B, is an all-in-one tester that can verify if a vehicle’s trailering circuits are properly functioning. IPA’s patented technology simulates trailer light and electric brake loads to test modern vehicles with integrated trailer brake controllers. It can quickly troubleshoot truck-side tow circuits (e.g. tail lights, turn signals, 12V+, reverse, and ground condition) and verify trailer brake output gain. The 25' cable allows one-man, in-cab testing. The #9107B supersedes the #9107A with updates for the latest model year vehicles. Comes in soft nylon case.