Light Pen Scanner
A light pen may be a computer data input device within the sort of a light-sensitive wand utilized in conjunction with a computer's CRT display. It allows the user to point to displayed objects or draw on the screen during a similar thanks to a touchscreen but with greater positional accuracy. a light-weight pen can work with any CRT-based display and other display technologies, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed an identical idea at the "Display 2006" show in Japan).
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