Hi,
Here's example of using thermocouples with Arduino. I use 2 on my woodstove, on the pipe and on the firebox.
https://arduinoinfo.mywikis.net/wiki/Brick-Temperature-Thermocouple#Brick-Temperature-Thermocouple
See Amazon etc. and search on "arduino thermocouple"
Like:
for $6
Or make your own:
https://arduinoinfo.mywikis.net/wiki/Thermocouple-MakeYourOwn
I use one of those on a kiln.