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(More customer reviews)This unit provides both temperature and relative humidity readouts. You can check both inside and outside temperatures in either Fahrenheit of Celsius. The outside temperature is provided to the display through a wire attached sensor. I located the display near a window and ran the wire under the lower sash and over the exterior sill, so that it was not necessary to drill any holes.
The indoor and outdoor temperature sensors are accurate (relative to each other) within an error of about 2 degrees Fahrenheit. This was determined by leaving a unit inside for a day, and noting both indoor and outdoor sensor readings, with both sensors indoors measuring the same ambient temperature. The difference between them was about two degrees.
The relative humidity readout of one unit, of the two I purchased on sale, has stayed permanently stuck at 20% and is, thus, of no value. The second unit's hygrometer, although not frozen, is inaccurate. I use the unit with the most accurate temperature readouts for indoor and outdoor temperature readings, which are usually within two degrees of other thermometers around the house.
The main goal motivating these purchases was to get reasonably accurate relative humidity readings. Owing to the failure of the two units I purchased to provide adequate humidity readings, and their temperature inaccuracies, the Holmes Digital Thermometer and Hygrometer is not recommended.
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Displays indoor - outdoor temperature / Shows current room humidity level / 12/24 hour digital clock / Easel back stand or mounts to wall / Includes 1 AAA
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