A roughness measurement sensor (15), comprising a sliding element and a sensor tip (15.4), wherein the sensor tip (15.4) is arranged in the region of the extremal end of a sensor arm (13.1) which has a longitudinal extension parallel to a longitudinal axis (LA) and is mounted in a lever-like manner. In some embodiments, the sliding element is formed in the manner of a skid (15.3), and the skid (15.3) lies, as viewed in a sectional plane (SE), perpendicularly to the longitudinal axis (LA), laterally adjacent to the sensor tip (15.4).