Hewlett Packard 27S 1989

Includes manual / Case and a new set of batteries.

Algebraic, programable Scientific and Financial Calculator

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The HP-27S was a  produced by , introduced in 1988, and discontinued between 1990 and 1993 (sources vary). It was the first HP  to use algebraic entry instead of , and though it was labelled scientific, it also included features associated with specialized business calculators.

The device featured standard scientific functions, including  and . Equations could be stored in memory, and solved and  for specified variables. , , and  number bases could be used. Business features included a  and  with up to ten appointments (each with a 22 character message string), as well as functions such as  calculations.