Graham wrote:

wrote in message
oups.com...
Are the cheap end versions any good ?

http://www.tooled-up.com/Product.asp...ensor-0-77-110

Specifically I want to use them to detect studs behind plasterboard
(1930's house) so I can hang shelves, pics
etc.

Or should I invest in a couple of powerful magnets ?

Or a thermal imaging camera.

http://www.ehsi.com/IR_thermography.htm

It's cheaper to hire someone to tear the wall down, and put it back up
taking precise notes of where the studs are, then hang the shelves for
you.

Pity really, as these would be so handy.