calculator.org

the calculator home page

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:

FeatureValue
TypeArithmetic
Functions6
Keys24
Precision8
LogicAlgebraic
Display typeVFD
Length159mm
Width76mm
Power SourceSealed battery pack
Year introduced1976

Replacements:

If you have an APF MARK 21 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by APF