Now understand that the device does not detect and does not
claim to detect earth ground. That obvious is one understands
what that $6 Radio Shack tester does. There is no simple
device to verify integrity of earth ground. And that Radio
Shack tester will only report a failed safety ground - not to
be confused with earth ground. That Radio Shack tester will
not report a good safety ground. It can only report a failed
safety ground. It, or a 3.5 digit multimeter, will detect
some safety ground problems.

This discussion is about earthing. Any wire that is 1/4
wavelength or longer is an antenna - not an earthing wire.
For 60 Hz AC electric, a long wire to earth may be an earth
ground. But this discussion is about radio frequencies and
noise. That distance to earth ground must be shorter. It is
just another reason why the incoming wire first makes a less
than 10 foot connection, either via surge protector or
hardwired, to the building's single point earth ground. As
was noted in earlier posts, using multiple (separate) grounds
can create problems both for humans and transistors. Problems
that the three light tester will never detect.

That three light tester is only a preliminary check. But
there really is no substitution for visual inspection.

Rob Mills wrote:

"RHF" wrote in message
om.
..
FIRST - Check Your A/C Power Outlets with an A/C Outlet
Analyzer like the RadioShack # 22-141. This simple devise
WARNS you of Faulty Wiring in 3-Prong 110-125 VAC Outlets
in your Household.

Out of curiosity I just checked RS and they do still stock these
($5.95) but about a year ago I purchased 4 of them on a close out
for .99 ea.. Yes, they are handy . I already had one but could
never find it when I needed it, don't have that problem now that
I have 5.
...