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A low battery generally causes the readings to be lower than actual. However a reading of 18-25 is not something I would be concerned about. I would suggest since you are new to this that you find another competent surveyor and have the deck checked again. If he/she is only checking the deck and not necessarily writing a report the cost should be minimal.
In my experience I can not feel any moisture from a drill test until the reading is up around 80 %
Good Luck
Gary
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