Steve -- The main reason for owning a moisture meter is to check the seasoning of wood, and make sure the wood is (a) enough and (b) equally dry among all the pieces in a project . Otherwise, you risk warping after assembly, as pieces of wood with higher moisture content will shrink more, leading to cracks and/or poor joints. It is not uncommon to get a supply of boards from the store and find various moisture content, plus it needs to reach its nominal level for the place you are using it.
Truth be told, except maybe just for fun, I have never bothered to check the moisture of my firewood. If it burns, it's dry enough.
Amir, I do not know that much about the non-invasive designs to know if irregular surfaces are a big issue. Could well be, point taken. Maybe you should build a drying shack... If nothing else, the project may take your mind off your case of chainsaw lust for a while!