The Seal Inspector is a directly applicable finished product that checks foil packaging in production lines. Several elements of the packiage like hermetic catch, displaced product, manufacture date, expiration date, code and label are examined in a control cycle. Incorrect products are ejected. The system set up can be set and modified easily by the user and parameters can flexibly be learned and kept within recipes. This way each user can determine its own quality standard. That Seal Inspector controlls with the suitable lighting also coloured plastic seal.