In the manufacturing process, it is common to have missing or additional components in the assembly of the final products. This can also happen in the PCBA, molding, plastic injection or metal stamping process too. This will result in wastages if the problem is not addressed in the early stage of the production.

This absence/presence application is important  for outgoing quality process to eliminate defective products going to the customer at all, else resulting in loss of confidence on the suppliers’ quality standards