Root Built in thermometer.

[vynylscratch]

I think our phone may actually have a built in ambient room temperature sensor. My room is about at 66 degrees and that is what the thermometer is showing on the phone. Using electronic thermometer HD. But it may just be a coincidence, would anybody else care to try?

 

[Rukbat]

After calibrating it (the temperature of the air directly above the phone is 72.82 degrees - I have a very accurate pinpont thermometer), I can calibrate the app to 71 degrees. That's as close as it'll get. (Something tells me that it's incrementing by degrees C.) We'll see if, over the coming days (it's going to be in the teens tomorrow), it holds calibration.

I suspect it's using the battery temp sensor, though, not the room temperature.