Quality control is a vital part of any manufacturing company that wants to uphold its reputation. The holy grail of QC inspection is to perform 100% inspection on all parts you are producing. However when you are producing large volumes of products this is not always fiscally viable. 

It is often possible to make non contact visual inspection equipment that will sit on a production line scanning key features of parts. This equipment will then remove any parts that fail the inspection. 

Equipment like this is often relatively easy to implement and can offer high rewards.