9 Scientific, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision) apparatus and instruments; electric, electromechanical and electrohydraulic controllers for use in drive systems, control systems and regulating systems, electric measuring, control and electric checking apparatus, in particular radar sensors for controlling the movement of a band and for quality assurance of strips of material; electronic cameras; digital sensors and ultrasound sensors and optical sensors for web guiding, in particular based on infrared spectroscopy and laser-induced fluorescence spectroscopy for quality assurance; machines for measuring and visualising oil films on (in particular running) material webs; inductive sensors; combined regulators for web guiding; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus and instruments for measuring width, measuring strip width in making and processing strips of material, in particular metal bands, camera-based apparatus, sensors, devices for capturing and recording images by means of sensors or cameras; apparatus for recording, transmitting and reproducing images and image data; data-processing equipment and computers; computer programs and computer systems for image processing in manufacturing processes for strips of material, in particular metal bands