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a thermometer/hygrometer does
a thermometer/hygrometer does not know the difference between a root cellar & house basement....my point is, they measure the air around them no matter where they are. so the best advice I can give you, is to buy the best thermometer/hygrometer that you can afford. read the reviews that others have left; they often will reveal things that the seller did not...some times, these reviews can mean the difference between a great product, & a piece of garbage...and they can often save you a lot of money too.