Players should not need to stop the game, change debug option, restart, and have a bunch of other info on F3 to know what the current temperature is.

• TFC Version: build 132

how about limiting the f3 function so that you can get temperature data by making a thermometer, or rock information by making prospectors pick

May be add an alcohol thermometer?
Casing be crafted for example by pouring glass in a mold.
Content will be an alchohol with a dye.
I have no good idea of how to mix them in non-wasting way, as you will only need very small amount - about 100mb or even 10mb.
So for now I would suggest to first fill it with alchohol (RMB or placing in a barrel) and then with dye same way.

Might point out that recently added waila integration shows temperature when you look at dirt, grass, sand, stone and any rock blocks.