Bests & Worsts Reviews from Amazon

Placed both together with fresh batteries from the same package. Both had different readings on humidity, both temperature readings were the same and accurate. Reversed batteries from one unit to the other and same result, readings were 6% different (ie 31% vs 37%). Left next to each other over night and same result the next day. Would not bother to purchase unless you bought 10 units and selected the best ones, even that should be verified by another accurate source. A hugh waste of time and energy, Only UPS made out on this purchase.