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APF MARK 31

The APF MARK 31 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 27 keys, and a VFD (vacuum fluorescent) display. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions9
Keys27
Precision8
LogicAlgebraic
Display typeVFD
Length140mm
Width76mm
Power SourcePP3 9V
Year introduced1976

Replacements:

If you have an APF MARK 31 that is no longer working, you can first try replacing the PP3 9V battery. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by APF