Is the a devices to search for file folder using a non contact sensor

This project received 5 bids from talented freelancers with an average bid price of $489 SGD.

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Project Budget
$12 - $30 SGD
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Project Description

We have lots of misplaced file folder in our library and I am think of using barcode sensor or any device that I can search for this misplace folder. Need some advise for a solution

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