I can't understand body temp

[FitnessWarrior2]

So I'm in my first week of using my versa 3. It took the three days to begin reading my body temp. But now it reads "1.2°F" or "-2.5°F"... what is this? How do I know what my temp is? Shouldn't it be more like "97.5°F" or what not?  How do I interpret this so I can get an idea of what my body temp is? 

[SteveH · Accepted solution]

There are 2 temperature tracking features with fitbit. Firstly, skin temperature variation which it can track itself and shows the deviation from your normal baseline (e.g. -2.5 F in your example). Secondly, core body temperature which cannot be automatically tracked by fitbit but we can manually log our core temperature after measuring it with a thermometer. This reading is the one that will be around 97.5

There's a guide to all this at https://help.fitbit.com/articles/en_US/Help_article/2458.htm