Damp Detector (Croydon, Shirley)

As main heading states.
We kept this in our caravan for any damp issues in the wooden framework that we could detect and could rectify before it got too bad. It's obviously not the best on the market, but did the job we needed it for.
We are now in the process of selling our van so we no longer need the detector.
Needs a PP3 battery which is not included.

Priority will be given to the person who can collect soonest and is also polite.