Here is what the clever little device had to say. I got the same readings from different outlets in different parts of the house, except for one room which shows two green lights and no red whether or not the button is pressed.

Attached are two files, one of the line checker in action, and another of the very detailed instruction manual which I had to scan in at 600 dpi and then quadruple the dimensions of the image to make the text large enough to read.

So now the question is: What is my next step?

tanstaafl.