I figure there's got to be some folks here who know and use moisture meters for wood enough to help here. We built & moved into a new house last summer, and we've had lots of problems with the wood floors - cupping and buckling. Can a moisture meter really get a reading through a finished floor? This is hickory with 3 coats of oil based polyurethane over it. A guy came out recently to check it, pressed the meter to the floor and said it was reading fine. Can it actually measure the wood moisture through the finish?