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They work but the values are meaningless, as they are calibrated for wood. They measure conductivity and the minerals etc in plaster etc are very different to wood, so are not reliable for measuring water content in anything other than wood...
danb-
There’s a scale you use. Wood moisture equivalent I think.
ETA: https://blog.protimeter.com/blog/wme/wood-moisture-equivalent-a-home-inspectors-guide
I haven’t read that, but looks like it covers it.
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There's a great Youtube video somewhere showing how you can use one of those meters to con a homeowner into believing almost any wall has dangerous levels of damp.
Hefty
NickCJ
The wall ones work on walls. They have little prongs that pierce into the plaster to take a reading. Do it behind a thing so the owners don’t notice the little holes and get upset.
https://www.amazon.co.uk/Moisture-Firewood-Handheld-Detector-Backlight/dp/B08NF56FGG/ref=asc_df_B08NF56FGG/?tag=googshopuk-21&linkCode=df0&hvadid=499390094390&hvpos=&hvnetw=g&hvrand=9023063221788643964&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1006598&hvtargid=pla-1245165363099&psc=1