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HP-32S RPN scientific calculator, 50th anniversary limited edition, 1989

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Introduced in 1988, the HP-32S was a popular calculator for science and engineering students.

The HP-32S was a simple Reverse Polish Notation (RPN) calculator, originally code-named "Leonardo." (RPN is a system for representing mathematical expressions without the use of parentheses.) Due to the broad range of functions, coupled with the $70 introduction price, the HP-32S was a popular calculator for science and engineering students.

This HP-32S was a special limited edition run for the 50th anniversary of HP in 1989.