Product review (5 stars): Just What I Was Looking For
These work great for what I wanted.  I have the main unit downstairs, one sensor upstairs, one on the hot side of my house, and the other on the cold side.  I can always tell when to open the windows to keep the house comfortable.  Screen is fairly easy to read, maybe a little dark in the evening, but then again, it's not distracting when watching a movie in the dark.

Yeah, it might be off by a tiny bit, but I wasn't expecting lab-grade sensors.  Works fine for my purposes.

I had some trouble getting the remote sensors to talk to the main unit.  I pulled the batteries, put them back in, and everything worked great.