Title: Get something else.
Review: I purchased this under the mistaken assumptions that it would be larger than it is, and that it would be ready to use. This unit is actually little bigger than a silver dollar, making the temp and humidity numbers difficult to read. Also, the unit HAS to be calibrated in order to work properly, something not mentioned in the product description. So, I had to order the calibration kit for $5.15 and it cost me an additional ten bucks to ship it, too. My gripe is, if a calibration kit is needed, sell it with the product!Lastly, it affixes to its mounting base via magnetism. Three days after I had installed it, I heard something fall. I didn't find anything, until a day later when I opened the refridgerator where it had been installed, and the hygrometer was lying on the bottom, having lost its magnetism. I wonder what's next.
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