A while ago I started using the Emacs calculator ("calc") instead of a phone or TI-84/NSpire/whatever was available. I found an absolutely astounding difference

A while ago I started using the Emacs calculator ("calc") instead of a phone or TI-84/NSpire/whatever was available. I found an absolutely astounding difference in ergonomics. I don't know if you want to call this a "calculator" or not, but wow... On another front, I use a physical calculator when baking. There's no worry about keeping it clean (ha), and hands that are wet or covered with flour do not have any problem unlocking it and getting presses on the screen to register.