Some fancy rice cookers do more than just use a thermocouple. You'll see them advertised as using "fuzzy logic". The brown rice setting uses a lower temperature and takes quite a bit more time than the same amount of white rice. There is also a timer, you can it to have the rice done at a certain time.

See this popular model for an example:

https://www.amazon.com/Zojirushi-NS-TSC10-Uncooked-Cooker-1-...