Why does Math.SE permit questions about calculators that have nothing to do with math, for instance this one?
I revised the short wiki text (aka "usage guidance") for the calculator tag as follows:
Questions regarding calculators being used to solve math problems. A clear statement of the math problem to be solved is required.
I'll add a long wiki write-up after surveying how the tag has been used historically. Note that I've removed any mention of specific calculator models from the usage guidance.