Touch-free sensors for automation technology are used in many places to optimise productions and logistical processes and support the efforts of manufacturers in nearly every industry to ensure maximum quality. Photoelectric switches, colour sensors, inductive and magnetic proximity sensors, vision sensors, shaft encoders and other sensors makes it possible by detecting, counting, classifying and positioning objects, recognising presence, shape and position and detecting surface differences. When shower gel is properly labelled and sorted on the store shelf, when a six-pack contains not five, but six bottles as it should, and properly sealed ones at that – then photoelectric proximity sensors have done their job. When furniture is perfectly finished, luminescence scanners deserve some of the credit – it is they that detect the proper glue line when applying veneers. Even the theatre depends on automation engineering: shaft encoders in lifting platforms ensure that the proper backdrop appears for each act.