Digital timer is a handy tool for keeping up with the brewing time of your tea or making coffee with various pour over methods.
A solid aid in all kinds of cooking, too!
French Press, percolator, auto drip
Drip, Chemex, Hario V60, cold brew, aeropress
Espresso, moka pot
Grind levels above are recommmendations. You can find suitable grind level for each device by testing.