I carry one of the wifes old curling irons on the truck, compact and all I've got to do is plug it in and it is pure inductance.
Climb High - Dive Deep - Everyone Goes Home!
Superbeast is a great tool and will also help find some future problems
I carry a toaster which I can plug in. Most service panels have a construction outlet by them. Also if no one is home you can use clip cords in the meter socket to test the hot legs and the neutral of the service.