While some manufacturing sites may not have quite as many inspection machines in their production line, having at least 3 is important since they enable the ability to monitor multiple assembly steps.

Inspection machines excel at catching defects immediately after their introduction, which, can reduce scrap and rework time. These machines also ensure that other aspects of the production line are operating at full capacity and are critical in detecting potential failures. For example: an in-circuit test machine may pass a joint, but an automated optical inspection machine can determine that the joint only has 20% of the recommended solder amount.