I meant to place more of an emphasis on the buttons. It needs to feel seamless. If I have to take a second to look and make sure I have my finger on the right button or wonder if I pressed it firmly enough, then that calculator is no good to me.

something with mechanical switches like a keyboard would have. Is there anything out there like that?

>>138501
texas instruments makes some simple ones. my mom has a solar powered one she's been using since the 1990s. it even has a bump on the 5 button so you know when your hand is positioned correctly, like the numpad on a computer keyboard. I think I've even seen them where they are almost tablet-sized, and the buttons are enormous.

try an office supply store. they should have something suitable. if you can't find one with a bump or other tactile thing on the keys, you can always add a dot of nail polish, or superglue on a little nub of plastic or something.

>>138564
what this guy says. just poke around some office or electronics stores, you should be able to find something that satisfies all your criteria for <10$, let alone a hundred. I don't know about literal mechanical switches, but you can easily fine one with large buttons that are firm enough that you can clearly tell whether you've successfully engaged them or not.

just download a calculator app on a tablet

>>138501
>The Windows and OS X calculators don't cut it when I need to do quick algebra
>algebra
That word...

Anyhoo, yes they do, you just need to learn the keyboard shortcuts.