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:

Feature Value
Type: Scientific
Functions: 20
Keys: 26
Logic: Algebraic
Display type: VFD
Length: 151mm
Width: 87mm
Thickness: 34mm
Year introduced: 1975

See other calculators by Citizen