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Unisonic 840-C

Unisonic 840-C
Image: Joe Haupt, CC BY-SA 2.0

The Unisonic 840-C is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 24 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions6
Keys24
Precision8
LogicAlgebraic
Display typeVFD
Length127mm
Width76mm
Power Consumption0.300000W
Power Source4xAAA
Year introduced1975

Replacements:

If you have a Unisonic 840-C that is no longer working, you can first try replacing the 4xAAA batteries. 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 Unisonic