In the last step of the process ( Final inspection – quality control ) a team of sharp-eyed inspectors give each PCB a final careful check-over. Here an inspector checks a customer’s assembly panel. She looks for any cosmetic defects like scratches. Then she measures the panel against the mechanical drawing, checking hole diameters with a tapered probe.

http://www.eurocircuits.com/index.php/making-a-pcb-eductional-movies/52-final-inspection

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