Xrite i1 studio , Colormunki photo , i1 pro.
Used with ArgyllCMS (free, Windows, Linux, Mac, command line) (there are other supported spectrophotometers listed but I’m not sure how common they are), ArgyllCMS pro (100$, Android), or Babelcolor CT&A (125$, Windows, mac, only i1 pro).
I have a i1 studio, paid 350€ new, but they are discontinued now, like the Colormunki Photo, the other day one went for 101€ + 20€ shipping from Italy on Ebay . They are more common on the US second hand market, Here is one for 150$ .
Maukka uses an i1 pro with CT&A, recognisable from the screenshots.