How to tell if your AC wiring needs an upgrade

Eric,

Thanks, I just bought one of these.  I recently spent quite a bit of time troublshooting input transformer hum on a tube amp.  The OEM insisted that it was almost certainly DC offset.  It took quite a while to convince myself I had no DC offset and eventually found a blow fuse in the amp taking out one half of the rectifier.   Obviously that fixed the problem. --Jerry

Thinking about this some more, I'd say the most common error you'll find is an outlet with the hot and neutral reversed.  In that case the n-e will show 118 V or so.  Easy to fix.

Recieved mine today. Going back tomorrow.  It was very nice to see my N-E reading is 0 on all circuits. But it is showing 102 on L-N for every outlet in my house.  L-N is currently 118 volts.  I have a monitor installed and check it every day.  So do I ask for a replacement or be happy I've played with it and move on. I'll decide tomorrow as I'm clicking the button.  I'm inclined to not trust it.

Jerry

@ozzy @jea48  Very interesting that Niagara is balanced. Great job figuring this out.