Product review (1 stars): Unreliable!!
The outdoor readings are frequently completely wrong  sometimes its temperature, sometimes its the humidity.  Today, it shows 1% humidity outside, but if I place the inside part of the product outdoors within a foot of the outside sensor, the inside reading shows humidity of 54%!!  (The temperature is only 5 degrees different at the moment.  I left it for 15 minutes just to make sure it had time to adjust and reset the outside sensor.)

I knew it was a problem b/c I tested both parts inside before putting the outdoor sensor outside, but it was only 5-10 degrees and the humidity reading matched.  I wasn't happy, but I thought it would do.  It has only gotten less predictable.

Waste of money.