Method and device for determining the level of a plurality of measuring points

Generated in a first direction (16), a beam of light is diverted in a second direction (20) at 90[deg] to the first direction. The second direction is rotated at an angle of rotation around an axis created by the first direction to correspond to the position of a measuring point. The beam of light has a cross-sectional intensity distribution (42) with a predominant direction (40). An independent claim is also included for a system for determining the level of two or more measuring points and a detector surface with a source of light.