The HP-37s scientific calculator?

[Sukiari]

(12-30-2020 10:23 PM)Maximilian Hohmann Wrote:  

(12-30-2020 10:00 PM)EngineerX Wrote:  ... to save battery ...

One thing that I forgot on my wish list: I never ever want to buy a product again (and that includes calculators) that only runs on disposable batteries. Either it consumes so little energy that it can be powered a solar cell or it needs a rechargeable battery. Like every piece of cheap Chinese junk does since a decade or so.

I disagree. You'll always be able to find coin and pen cells.