Ambient temperature.
When my Zumba room says 71 and it feels like 74, I wish I could check it.
Also, sometimes I want to know how cold a fridge is. Like at a hotel, is that little fridge really cold enough for my leftovers?
Or, a temperature difference from the sun to the shade just steps apart.
Plus, when I lived in TN my property felt over five degrees cooler than just 2 miles away in the same city. Something would happen when we would turn a certain corner on Huff and Puff Rd. (Yes that was the real name of the road). I wonder how many degrees it really was.
I used to have a little thermometer and compass thingy that I would keep in my purse. I probably still have it in a junk drawer.
I keep a tape measure in my purse. Every so often I pull it out to measure something. It’s fun and funny.