Citizen 820R

The Citizen 820R is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 22 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 7
Keys: 22
Precision: 8
Logic: Algebraic
Display type: VFD
Length: 151mm
Width: 87mm
Thickness: 34mm
Power Source: 4xAA
Year introduced: 1974
YearDiscontinued: 1976

See other calculators by Citizen