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I have a couple of stains on the plaster ceiling. They were there when I moved in, but I think one is getting worse, but it could be my imagination. Will a damp meter tell me if the plaster is wet or dry? Or are damp meters only effective for very wet areas?
Thanks

Picture of stain which looks like pipework to me.

A damp meter reads the resistance of what ever you "probe" The surface being tested doesn't have to be wet to show a reading.

If you are not sure if it is getting bigger, why not mark the area with...........a pencil

Thank you S-E