In article , Mike
writes

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
Mike wrote:

snip


I've got an old Rapitest stud/joist/pipe/cable detector, bought 10 years ago
after I detected a cable with a drill bit.
Unfortunately, I've lost the destructions, and I don't know if its still
working or not. It seems to be working fine when switched to 'metal' mode,
(i.e. it squeals and the light comes on over a cable) - in 'wood mode' even
with the sensitivity set to full, it detects nothing - put it on a
windowledge and the light stays off and the very faintest of a ticking noise
can be heard - might just change the battery

2 other questions - ;-)
1) the wall is an internal wall 2.4m long between two bedrooms, with only
the loft above. Will there definitely be studding, or am looking for
something that is not there ?
2) PP9 batteries - how come they are only ever found in devices you only use
once in a blue moon, and how come their lifespan is always bluemoon ?. I
really cant see any justification for not using AA cells

I think you mean PP3. PP9's are enormous. The problem is you only get 3V
off two AA's, and much electronics needs the higher 9V of the PP3 to
work.

The other setting on my detector is not for wood, but for electrical
cables, and I think yours might be the same.

I find studs on the metal setting, just play with the sensitivity. Even
if you can't detect the stud, you should find some nails where the
boards are nailed on.
--
Tim Mitchell