Lol, I don't know who would but yea that would give you a high voltage reading. Most people have circuit breakers though, or GFCI receptacles. So if you were to go above say 240v (or whatever it is set to), the flow of electricity would snap off and wouldn't connect. Any way, if anyone who doesn't have one of these and decides to make one, please let me know how it works. Like I said, I have made these before and they have worked but I cannot test this one so I want to make sure I guided it correctly.