calculator.org

the calculator home page

APF MARK 51 (Scientific Calculator)

The APF MARK 51 is a scientific calculator with 8 digits precision and algebraic logic. It has 17 functions, 19 keys, and a VFD (vacuum fluorescent) display. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeScientific
Functions17
Keys19
Precision8
LogicAlgebraic
Display typeVFD
Length140mm
Width76mm
Power SourcePP3 9V
Year introduced1975
Year discontinued1975

Replacements:

If you have an APF MARK 51 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 model as a replacement:

See other calculators by APF