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Unitrex 91PM

Unitrex 91PM
Image: Joe Haupt, CC BY-SA 2.0

The Unitrex 91PM is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 23 keys, and an LED (light-emitting diode) display typical of calculators of this era. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions5
Keys23
Precision8
LogicAlgebraic
Display typeLED
Length140mm
Width70mm
Power SourcePP3 9V
Year introduced1975

Replacements:

If you have a Unitrex 91PM that is no longer working, you can first try replacing the PP3 9V battery. 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 Unitrex