Festo controls manufactures optoelectronic checkbox systems for transparency in feed processes. Modern automatic assembly and production machines working with small components include an automatic feed system as well as contact less product identification, position detection, quality checking, sorting and picking. Checkbox family of compact optoelectronic system is useful as conventional and mechanical solutions. Checkbox optoelectronic systems are available in combination of an imaging system and conveyor and ejector mechanisms. The optoelectric checkbox systems are available with an integrated camera to analyse difficult conveyed workpieces continuously on the basis of their contours and detect position and quality. Checkbox optoelectric systems are suitable for rotationally symmetrical workpieces and pre-oriented workpieces of any desired shape, 0.5 to 80 mm diameters and 3 to 80 mm lengths. Checkbox systems come with the contactless checking method to eliminate wear on conveyed workpieces, while the integrated quality check ensures high product quality. The checkbox optoelectric systems are available with a reliable feeding for reducing system downtime and increase the availability of automatic assembly machines. The checkbox units come with salient features of easy operation and can automate `learn` different workpieces by teach-in function with no programming.