Mike D has brought this to us :
I'd like to buy a damp meter for assessing the damp situation in my
house. There is some rising damp, which has been well-disguised by
damp seal and wallpaper and etc. I mainly want to locate the worst
areas so I can remove bricks in the wall and clear the cavities at
those locations. (I'm convinced that the rising damp ocurs in places
where the cavity contains debris which has piled up to above DPC
level). Why do I care, if the problem has been well-covered up?
Because I want to sell the place soon, and hope to minimise what will
be found by a prospective buyer's surveyor.

I'm hoping that something costing less than £10 will do the job. Can
anyone recommend one, or offer tips on choosing one?

Thank you,

Mike D

As others have suggested - a cheap and cheerful digital meter with a 10
or 20 Mohm range plus a couple of (very) sharp probes fixed into
something to keep them a set distance apart and make them easier to
use.

Then learn to use it-
Even the moisture from your skin when touching the probes is enough to
cause a reading, so take time to get used to what to expect. The lower
the resistance, the more conductivity, the more moisture - but it could
be simple surface condensation, so test when there should be no
condensation about.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk