the aliexpress calculator is my favourite least favourite calculator because you can key in stuff, and it will turn around and tell you it's too hard to calculate and will just refuse to do it.
in other cases it will crunch some numbers, and give you a completely false result. it would be amusing, if not for the fact i could be tempted to reach for it, if it is in reach, just to run a number or two, without realising how wrong it might end up.

i found https://hackaday.com/2020/07/02/review-calculator-kit-is-just-a-few-hacks-from-greatness/ and there's a link out to an RPN firmware for it. that would probably be useful to turn it from e-trash to something else. hmm.

calculatorposting will continue until morale improves