As a house thermometer it's probably fine, but don't let it get cold.
We purchased this thermometer for our truck. We go out in all sorts of different weather, and especially after our stint in Montana last November I thought it would be nice to know what temperature it was both inside and out of the truck body.
The thermometer fit perfectly in our 2002 Tacoma. We pulled the ashtray and pushed it up into the remaining hole using double-sided tape to hold it in place at the top and at the back against the face below it. It worked great!
I then ran the outdoor sensor through the hole in the carpet and floor. The hole in the floor is as from the factory, it just had a rubber plug I had already pulled out for running a radio antenna wire. I had also slit the carpet for the same purpose.
My first attempt had the sensor inside the frame, this didn't work as too much heat got stuck there and the thermometer was WAY off if the engine was running. So next I moved it to the outside of the frame and back a ways, tying it to the rear cab mount on the frame. That worked great. We compared it to thermometers on banks, and at houses we were staying at, and it seemed to read about right.
Now comes the problem. Jess and I were up looking at land up in Vermont, and slept out in the truck. Temperatures got pretty cold that night, but not THAT cold, maybe down to 0 or so, and in the morning the thermometer didn't work, and hasn't worked since.
So, it's probably a fine thermometer for house use, but do not buy this for a vehicle, or for use anywhere that drops notably below freezing.