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APF MARK 28

The APF MARK 28 is an arithmetic calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
LogicAlgebraic
Display typeVFD
Length114mm
Width64mm
Power SourcePP3 9V
Year introduced1973

Replacements:

If you have an APF MARK 28 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