Abstract: An inspection station for checking the correct placement of a lid on a filled plastic container that is traveling on a conveyor that includes: a detector plate assembly (16) that has a flat surface (32) and an inclined surface (44); a support assembly (18); a mounting assembly (22) for attaching the detector plate assembly (16) to the support assembly (18) for holding the flat surface (32) in a predetermined parallel relationship with a top or conveying surface (30) of the conveyor (12) while simultaneously allowing vertical displacement thereof; a first sensor (54) for detecting the presence of a plastic container (20) to be checked or inspected; a second sensor (56) for sending a signal when the detector plate is within a selected range of vertical displacement.