These scanners are capable of recognizing a pre-specified type of mark made by pencile or pen.
MAny students might have appeared in objective type test,on which they had to mark their question answers on speciall pre=printed test scoring sheet by darking a small square,circular,or oval shaped box by a pencile to indicate their correct choice out of various given options..
In pakistan NAT conduct these type of test which are marked computerzied by OMR....
Thanks for sharing
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