Modern Technology

HP 15C

HP 15C

I got a sad note today from a friend who recently lost his beloved HP 15C calculator:

It had worked flawlessly for 28 years.  One set of batteries lasts 7 years or more.  One key was getting a bit worn.  Dropped a few times, of course.

A relic of what the U.S. could once do.


  1. condolences from a long-time 32SII user. I’m a sucker for the RPN entry and those clicky keys. I’ve had mine and the batts have a solid 10 years on them so far.

  2. I couldn’t to the RPN as fast as the other way when I did my math series, so I went with the Casio. My buddies with the HPs always seemed to have better answers…



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