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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.
Hefty
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...