How many times have you wondered if your heated shield was actually working? So many things can go wrong from the shield, to the 3 or more cables, to the connector on the sled, to the fuse. You can try swapping cables with your buddy but that can still take a long time to get up to temperature. This small, lightweight, inexpensive little device makes it easy to figure out where the problem is, and it also doubles as a small flashlight for looking at maps or inspecting the sled at night.
This has been recommended by your fellow QR members in other posts, so if you have any questions, feedback, or experiences, please feel free to discuss them here...