Help with Moisture Meter Selection

Hi, new home inspector here. I am trying to a good moisture meter. I currently got the Tramez MRH III and while it is pretty spiffy, when I take drywall readings it seems to show a higher moisture content that when I do wood (usually in the 30 - 50 % range). I am looking for something that is simple and will give me a warning if an area is too moist.

Thanks,

Tim
Home Inspection Geeks

https://www.nachi.org/forum/f60/whats-consensus-moisture-meters-112608/