If you have an RV that runs on 30 amps you need both units. an expensive surge protector, but I didn't want to damage it by simply plugging it into an outlet. Worse, I didn't want to damage all of the RV's electrical system. I needed a simple diagnostic tool that would alert me to a wiring issue. This smart tread kit is perfect! Nice, simple solution. Buy it! This can save you many euros on future repairs.
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