Originally Posted by CallMeVilla
While I understand the problems with the NCD, if multiple outlets are reading the same problem, I tend to suspect it is detecting a problem.
I draw the opposite conclusion.
There are many ways to miswire an outlet and it'd be unusual for all to be miswired the same way. It may also be unusual to have every outlet in a house wired correctly.
Plus in the NCD there is a lot of electronics, plus air, between you and the energized conductor. Complexity makes for false positive and false negative readings. You are trading safety and convenience for these problems and I'm not sure who got the better of that deal.
The least complex is an incand. test light that has been first tested to make sure it is not blown out. And these bulbs do not respond to Phantom Voltages.
When things get weird run an extension cord as a test lead back to the load center and use the neutral, ground and both hots at that place as reference points to make your measurements.
This may be a classic example ofhttp://www.lifehack.org/articles/communication/how-the-sunk-cost-fallacy-makes-you-act-stupid.html
The thing may or may not lie to you and troubleshooting is difficult enough as is.
It may be useful for troubleshooting Christmas tree light strings but otherwise give it to someone you don't like. . .
The cost of it was tuition for the lesson you are now learning.