Meaning of “light pen” in the English Dictionary

british dictionary

"light pen" in Business English

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light pennoun [ C ]

uk us IT

a pen-shaped object that uses beams of light to read bar codes (= small rectangular patterns of printed lines that store data) or that you use to touch a computer screen in order to choose information:

Outgoing inventory can be quickly checked with light pens connected to each terminal.

(Definition of “light pen” from the Cambridge Business English Dictionary © Cambridge University Press)