DH-FH100 is an inline inspection system working together with folding-gluing machines to read bar code on every pack to find out the confusion situation where other types of color packs are mixed up with the current type. As soon as a different type of pack is detected, the system will alert users with sound and light, stop the folding-gluing machine, and report the identification code and amount of the wrong type packs. The system can be mounted on any folding-gluing machine to guarantee that packs-confusion accidents will not happen.