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Question 1

what is the difference between laser scanner barcode readers and pen scanners

Answer 1

lasers are used instead of light, and the laser is reflected back up to the detector, allowing it to be read from further away, faster than a pen drive, still low volume

Question 2

how does a ccd (charge-coupled device) reader work

Answer 2

it has sensors and lights lined up along the front, scanning the whole barcode at once