HP’s most accurate financial calculator, oddly enough, and despite only returning the ceiling of solve-for-n.
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6 points
My dad was a surveyor almost my entire life, he always had this (or a very similar model) in his pocket or on his desk.
4 points
As a surveyor, he probably had an 11c or 15c (the 12c is the financial version of the Voyager series).
Aside: Swissmicro sells a series of voyager clones with modern hardware:
https://www.swissmicros.com/product/dm15l
More info on the original HP calcs:
https://en.wikipedia.org/wiki/Hewlett-Packard_Voyager_series
2 points
2 points