Stroboscopes are versatile instruments for the visualization of very fast movements. They are important and necessary tools for the inspection and control of machines and manufacturing lines e.g. in printing or textile industries. Stroboscopes could also be used for the non-contact measuring of rotational speed. If the stroboscope flash frequency matches the frequency of movement, the test object appears stationary. It can be observed and its frequency of movement recorded. The range of products available today allows bandwidths exceeding three metres to be illuminated.