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Citizen 820SR

The Citizen 820SR is a scientific calculator with algebraic logic. It has 20 functions, 26 keys, and a VFD (vacuum fluorescent) display.

Facts at a glance:

FeatureValue
TypeScientific
Functions20
Keys26
LogicAlgebraic
Display typeVFD
Length151mm
Width87mm
Thickness34mm
Year introduced1975

Replacements:

If you have a Citizen 820SR that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Citizen