Moisture Meter. Pros and cons?

Hey everyone, I’m getting started and would like some input. What are the pros and cons of moisture meters? Where do they work the best and where shouldn’t they be used at all (legally speaking)?

Here’s one of several pretty good threads from the old bb:

Very nice. Thank you. This forum is a little overwhelming (in a good way) when you first take a look at it. Tons of stuff. I don’t know where to start, kind of like my inspections. (Just kidding)