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MBO Sigma 1

The MBO Sigma 1 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 19 keys, and a VFD (vacuum fluorescent) display. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions6
Keys19
Precision8
LogicAlgebraic
Display typeVFD
Power SourcePP3 9V
Year introduced1975

Replacements:

If you have a MBO Sigma 1 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 MBO