Brand: SHARP
Model: EL-509D
Type: Scientific calculator
Picture: SHARP EL-509D
Batteries: LR44 x 2
Lifetime: Introduced: 1979
Terminated: unknown
Notes: Thin, 10 digit, LCD calculator with the basic scientific functions and memory. It can also perform calculations with fractions and do statistics. It even has a random number generator.

Enveloppe This calculator was donated to the museum by Martin Zámečník. Thanks, Martin! It was sent to The Netherlands all the way from Czechia. Much appreciated.

This calculator has the distinctive blue memory buttons (which I quite like) that are also available on the SHARP PC-1403, the SHARP EL-506H (and probably others).