On Wed, 25 Mar 2009 07:28:07 -0700, Larry Caldwell
wrote:

In article ,
(Bob) says...

They used steel studs. I've had trouble with those for various
reasons, but in this case, that may pay off.

Go back and give the stud finder a try. With that much steel in the
stud, you should be able to locate it with no problem.

You'd think so, but mine gives a solid 'on' over the tile. Backing
away diminishes the sensitivity, of course, but it seems to be all-on
or all-off. A sensitivity control would probably help.

Inductive
resonance stud finders will detect a drywall nail.

Maybe I need a better stud finder. Is there a model that you would
recommend?