A light section sensor comprises an optical transmitter (1), which produces a first light beam (2), a transmission optical unit (3), which reshapes the first light beam (2) into a line-shaped second light beam (4) and emits the latter into a monitored region, a structured receiver with a reception optical unit, which captures a diffusely reflecting object (10) situated in the monitored region at an angle that depends on the distance and images said object on the structured optical receiver, wherein a second optical transmitter (1a) according to the invention produces a third light beam (2a), which illuminates a radiant field stop (5) via an illumination optical unit (8a), wherein a fourth light beam (6) is produced by a projection optical unit (8b), the radiant field stop (5) projecting said fourth light beam into the monitored region and said fourth light beam being superposed on the second light beam (4) either directly or via a beam splitter (9), wherein application-specific symbolsor information items are presented on the basis of the light beam (6), wherein, inter alia, it is possible to mark a region of particular interest (ROI) (7).