APF MARK 21

APF MARK 21
Image: wass.net used with permission
The APF MARK 21 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 24 keys, and a VFD (vacuum fluorescent) display. The power source is Sealed battery pack.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 6
Keys: 24
Precision: 8
Logic: Algebraic
Display type: VFD
Length: 159mm
Width: 76mm
Power Source: Sealed battery pack
Year introduced: 1976

See other calculators by APF