In an all-electric house, look at the stove, dryer, and water heater, and well pump. Those are your biggest loads by far, DUmmies. The fact you have an intermittent fault is not a good thing, but go ahead and keep that shit plugged in and running on an 85-volt supply. Have fun replacing all your burned out shit afterwards. I'm also guessing the DUmmie hasn't isolated loads or checked his breaker panel.
And also, DUmmies, if you set your multimeter on ohms and you try to measure voltage, your meter will go KABOOM. So it's not the meter that's dangerous, it's YOU.
Frankly, I wouldn't use anything that isn't rated Cat III to 1000 volts or Cat IV to 600 volts. Those cheap pieces of shit you get from Radio Shack are just that--shit. Spend a few bucks and get a Fluke.