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Casio 121-MR

The Casio 121-MR is an arithmetic calculator with 12 digits precision and algebraic logic. It has 8 functions, 26 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions8
Keys26
Precision12
LogicAlgebraic
Display typeVFD
Length170mm
Width120mm
Thickness32mm
Weight294g
Power Consumption0.350000W
Power Source4xAA
Year introduced1975
Year discontinued1975

Replacements:

If you have a Casio 121-MR 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 Casio