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Not every campground pedestal delivers clean, correct voltage, and running sensitive RV electronics and appliances on bad power can cause real damage. This Camco AC line voltage meter plugs into an outlet and gives you a quick voltage reading so you know what you're dealing with before connecting your rig.
It's a small, inexpensive tool worth keeping in the toolbox for a fast pre-hookup check at any new campsite.
A quick way to confirm safe voltage before you commit your RV's electrical system to an unfamiliar outlet.