On a wide conveyor section, objects or containers being conveyed in sequence have to be detected with positional accuracy and a short response time to trigger their labeling. The use of retro reflective sensors is an economical solution with a large function reserve, particularly suited for wide conveyor sections and dirt. The universal M18 short design with or without angled optics features easy installation, a large range with high functional reliability and easy operation using a potentiometer. Due to the angled optics, the retro reflective sensor only requires a small installation space and mechanical integration is easy.