pocket calculator

an electronic calculator small enough to be carried on one's person.
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Computing Dictionary

pocket calculator definition

A small battery-powered digital electronic device for performing simple arithmetic operations on data input on a keypad and outputting the result (usually a single number) to a simple LCD or other display.
The most sophisticated programmable calculators are really pocket computers which are limited to handling numerical data only.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
It seems to work great on my pocket calculator and all those highway
  construction signs.
HP not only launched a succession of world-changing products, such as the
  pocket calculator.
Indeed, aside from the pocket calculator, the introduction of new products has
  fallen off drastically in the last ten years.
The adding machine was generations into the future, and even the humble pocket
  calculator was almost a century away.
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