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I have a dual trace scope, with only one good, but well worn probe now, because in the past I did the same thing. You need to use an isolation transformer, as most variacs do not isolate the equipment from the line. I myself have a isolation transformer that also works as a variac with switchable voltage output. If you could get a hold of one something like the once pictured that I have, they are a lifesaver, (possibly literately). Believe me, line voltage across your body is not fun. Yes, it happened one to me when I lived with my parents many years ago, from a faulty waffle iron, next to the kitchen sink. Luckily I was able to jerk myself off of it, as AC current has a tendency to lock your muscles.
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