Product review (3 stars): not reliable
The monitor arrived in two. To test whether they are working, I put them in the same room side by side. It is funny to see that they always tell different temperatures (1 degree difference, so no big deal) and (8 to 15 percent) difference for the humidity. It entertains me to see the "twins" can never agree with each other. It does not bother me much. I just take the average to get a better estimate about the room. The monitors do look neat. But just don't be fooled by them if you install them into two different rooms.