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Hewlett Packard 48G graphing calculator - $50 (COSTA MESA)
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A classic. IYKYK. I used it briefly in engineering school.
32K RAM!!! haha. That's really all you need.
Perfect condition. I can't find the users guide but it's online:
https://literature.hpcalc.org/items/375
https://en.wikipedia.org/wiki/HP_48_series