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MaMalody, my voltage tester has a 20-amp plug. It is plugged into a 20 to 30 amp adapter. When I need to check 50 amps, I use an additional adapter, 30 to 50. It's not as convoluted as it sounds.
My tester is from Walmart's hardware/electrical dept and cost less than five bucks. I also have a VOM but use the tester to check the park's circuit before I plug in the cord. The tester has 3 lights and on the side it tells you what the combination of lights mean.
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