Very easy to use, sometimes it may require a strong push or punch to insert into the material. drywall. I don't know if I classified it as a building material, but it wasn't wood. I may have missed it in the info pack because I haven't read it much, so it might be clearer. Not sure. I have no way of verifying his accuracy, so I can't speak to him. I knew the wall was wet because a pipe had burst and the wall appeared damp/wet and the reading was consistent with wet. That's all I can say. Although it works fine for my applications.
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