Product review (5 stars): Good Temps. Good Price. Good device.
We really like this indoor/outdoor temperature+humidity device!  So far, it seems to be quite accurate.  We had the outdoor sensor inside for a day before hanging it outside and the temps tracked perfectly!  Only two considerations: First, the size surprised us - it's a bit larger that imagined (approximately 6 x 3.75 inches); Second, anyone buying this instrument should make sure to hang the outside sensor out of direct sunlight and weather.  We have it hanging under the railing on our deck, away from the side of the sun (in other words, in the shade).  So far, so good!