No, the meter will read up to 10% on a dry deck from the moisture in the air, and moisture that should be in the Balsa or marine ply.
I use my meter to detect changes in the moisture readings as I slide the meter over the deck and hull. I wipe the deck with a cotton cloth as I slide the meter along to remove dirt, or any surface moisture (even on a dry day). When the meter reads over 20% that is a good indication of excessive moisture in a cored deck or hull.
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USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified Instructor - Also certified in Recreational Marine Electrical Systems