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Monroe 20

Monroe 20
Image: wass.net used with permission

The Monroe 20 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 18 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 6x1.5V sealed.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions5
Keys18
Precision8
LogicAlgebraic
Display typeLED
Length152mm
Width89mm
Thickness50mm
Weight417g
Power Consumption1.800000W
Power Source6x1.5V sealed
Year introduced1972
Year discontinued1973

User Manual

You can download the Monroe 20 manual from the manuals website.

Replacements:

If you have a Monroe 20 that is no longer working, you can consider replacing the calculator with a modern equivalent.

We suggest the following current models as possible replacements:

See other calculators by Monroe