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Panasonic 840 (JE-840U)

The Panasonic 840 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 4 functions, 18 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions4
Keys18
Precision8
LogicAlgebraic
Display typeVFD
Length140mm
Width83mm
Power Consumption0.500000W
Power Source4xAA
Year introduced1974

Replacements:

If you have a Panasonic 840 that is no longer working, you can first try replacing the 4xAA 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 Panasonic