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