If he likes gadgets, he may get a kick out of one of these Galileo thermometers...they are available lots of places online as well as some department stores
https://www.walmart.com/c/kp/galileo-thermometers
I got this one for my brother, and he loves it...it looks elegant as well
https://www.walmart.com/ip/Home-Anal...9?athbdg=L1700