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MBO Sigma 20

The MBO Sigma 20 is a scientific calculator with 12 digits precision and algebraic logic. It has 26 functions, 25 keys, and a VFD (vacuum fluorescent) display. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeScientific
Functions26
Keys25
Precision12
LogicAlgebraic
Display typeVFD
Power SourcePP3 9V
Year introduced1975

Replacements:

If you have a MBO Sigma 20 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 MBO