During the presence inspection, a product is checked for completeness. Usually, this happens right after an assembly step to remove incorrect parts from the production process or send it to a rework place as quickly as possible.
A presence inspection is a kind of completeness inspection. The product is complete, if the part which can be examined is present. Frequently a presence check is linked also with a position or location inspection.
The following images show an example of a presence inspection of caps on plastic bottles.
The following images show an example of an inspection of presence of holes in body side.
The following video shows a highspeed presence and print inspection done with a vision sensor.