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Monroe M-20

The Monroe M-20 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 4 functions, 18 keys and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Rechargeable battery pack.

Facts at a glance:

Type Arithmetic
Functions 4
Keys 18
Precision 8
Logic Algebraic
Display type LED
Display size
Printer
Length unknown mm
Width unknown mm
Thickness unknown mm
Weight unknown g
Power Source Rechargeable battery pack
Country
Original price unknown
Est. current value unknown
Year introduced 1972
Year discontinued

See other calculators manufactured by Monroe.