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OK, that makes me feel better. Polarity and ground fault are the reasons I use that tester. Actually, I have the tester plugged into one of those super duper Camping World voltage/amperage testers a good friend gave me. That's still only going to check one leg of 50amp for voltage. That, in turn, is plugged into the adapters for 30 and 50 amp. The CW tester I use also to determine amperage draw of our various appliances, like fans, electric heaters, toaster, coffee pot, etc., so I know about what they draw. However, I lost my notes so need to do it again someday.
I also have a VOM but don't normally use it to test the park power. I use that CW unit instead. I also have a voltage meter on an outlet in the rig where I can see it from my chair.
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