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Unimark 280

The Unimark 280 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 23 keys, and one of the early LCD (liquid crystal) displays which incorporated a yellow filter. The power source is 4x1.35V cell.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions7
Keys23
Precision8
LogicAlgebraic
Display typeYLCD
Length127mm
Width72mm
Thickness12mm
Power Consumption0.001000W
Power Source4x1.35V cell
Year introduced1975

Replacements:

If you have a Unimark 280 that is no longer working, you can first try replacing the 4x1.35V cell 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 Unimark