Using a film between several glass panes, laminated safety glass prevents dangerous shards flying around in the case of breakage. The adhesive film is clamped during the production. In doing so, it is important that the film shows the correct thickness in order to be able to ensure the required safety. Thickness can be measured on one side using the optoNCDT2401 confocal system. The light from the sensor penetrates the glass and displays the thickness of the film in the pane.