Another vote for my Casio FX82. Ease and speed of use are why I prefer it to any calc apps.
Though I'll admit that I have a bias towards physical, single purpose devices. I use a physical (digital) timer in the kitchen, and a physical mechanical metronome when playing music.
Though I'll admit that I have a bias towards physical, single purpose devices. I use a physical (digital) timer in the kitchen, and a physical mechanical metronome when playing music.