Yeah, there are a lot of different product and honestly I don't know much about the technology but most at least say what they are used for and some just say wood and drywall so you can eliminate those.Have looked at a number of these on a google search but dont know which are adequate without going overboard cost-wise
If you have a Volt meter tester and an area of dry core...Any suggestions for a reasonable moisture meter now that I've ripped all my ports out and the core is drying out?