I collect HP calculators: I have an HP 12C, an HP 15C Collector's Edition (there are a few of them left still for sale), an HP 32Sii, and an HP 48SX. I sometimes use them, but whenever I'm in front of a computer (which is almost all the time), I find myself using the Unix dc command.

Handheld calculators are nice, but outside of exam settings, I could use a smartphone or a computer, though calculators are nice when I want to work distraction-free through something that requires performing calculations. I believe this is why HP largely exited the calculator market: HP's target market was professionals, and cheap computers and smartphones killed the calculator market for them, similar to how electronic calculators killed the slide rule. Texas Instruments, however, is still in the calculator business, largely due to their successful courting of American middle and high schools, as well as ETS and other testing agencies, beginning in the 1990s. I don't know the situation in Japan regarding calculator usage, but I see Casio scientific and graphing calculators proudly displayed at electronics stores such as Yodobashi Camera and Bic Camera.

I use emu48 on my phone emulating the HP-50g, which was almost exactly the same size as the phone so my muscle memory somewhat carries over (minus the tactile feedback of a real keyboard). I still have the physical calculator on my desk at home, with no batteries in it so it's only usable within reach of its USB cable.

Anything that goes beyond what that calculator's UI can reasonably handle is going to end up in a Jupyter notebook or something like that.

> What calculators are you guys using that aren't in academia anymore and don't need the "exam approved" limitations?

I still have my TI-85, but I essentially haven't used it since I left college. For 99% of what I need, I use either Python, or what's built into Firefox (e.g. unit conversion), or DDG. For that last 1% (e.g. full CAS functionality), I tend to grab whatever web-based non-AI tool is handy.

I use a TI nspire CX CAS.

honestly, I think it makes no sense to spend more than 30$ on a calculator if it can't do symbolic math.

The way you input things like division, integrals, matrix, etc. on newer calculators like the nspire is far superior than the older calculators (eg. ti-84, ti-89, etc.). They look like how you write them on a blackboard instead of relying on purely parentheses or "," and ";" to separate parameters. It's like going from Excel to Mathcad

I used to keep my old TI-82 (or was it -84?) from high school and a simpler sturdy solar-powered calculator near my desk, but I realized I always just used either my computer (IRB in the terminal usually) or Apple's calculator app on my phone and never ever touched my physical calculators. So they've now been put in storage.

The most common way for me to do basic arithmetic is by opening up a Python shell and using it as a calculator. This is what I typically do when I go through my finances every few months and calculate prices for things.

I still use my TI-89 from high school, but I'm interested to find if there are any open hardware/firmware calculator projects with basic engineering tools and a CAS.

Ti89 emulator on my android. Muscle memory from high school and college use is strong.

Honestly, most of the time whatever the newest variant of the TI-30 is ends up being plenty (and what I have at my desk).