Absolute distance measuring device comprising • a transmission unit having ∘ at least one laser array(70, 7A, 7B, 7C), the laser array (70, 7A, 7B, 7C) comprising multiple measurement laser emitters (70e, 12A,12B) arranged along a laser array axis and configured to generate a beam pattern and ∘ a beam exit area, the transmission unit being configured to emit a plurality of transmission beams via the beam exit area at different measurement angles, • and a receiver unit having ∘ a measurement beam entry area and ∘ at least one receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprising multiple measurement receivers (71r, 9) arranged along a receiver array axis, the receiver unit being designed ∘ for beam detection by a respective measurement receiver (71r, 9) of at least one transmission beam of the plurality of transmission beams returning via the beam entry area and ∘ for measuring of an absolute distance based on a respective detected transmission beam and the principle of time-of-flight, the absolute distance measuring device being characterized in that the laser array (70, 7A, 7B, 7C) comprises at least a first reference laser emitter and the receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprises at least a first reference receiver, the reference laser emitter and reference receiver defining an internal absolute distance reference beam path (72, 72a-c) of defined length for calibration of the device with respect to said measuring of absolute distance. • a transmission unit having ∘ at least one laser array(70, 7A, 7B, 7C), the laser array (70, 7A, 7B, 7C) comprising multiple measurement laser emitters (70e, 12A,12B) arranged along a laser array axis and configured to generate a beam pattern and ∘ a beam exit area, the transmission unit being configured to emit a plurality of transmission beams via the beam exit area at different measurement angles, ∘ at least one laser array(70, 7A, 7B, 7C), the laser array (70, 7A, 7B, 7C) comprising multiple measurement laser emitters (70e, 12A,12B) arranged along a laser array axis and configured to generate a beam pattern and ∘ a beam exit area, • and a receiver unit having ∘ a measurement beam entry area and ∘ at least one receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprising multiple measurement receivers (71r, 9) arranged along a receiver array axis, the receiver unit being designed ∘ for beam detection by a respective measurement receiver (71r, 9) of at least one transmission beam of the plurality of transmission beams returning via the beam entry area and ∘ for measuring of an absolute distance based on a respective detected transmission beam and the principle of time-of-flight, the absolute distance measuring device being characterized in that the laser array (70, 7A, 7B, 7C) comprises at least a first reference laser emitter and the receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprises at least a first reference receiver, the reference laser emitter and reference receiver defining an internal absolute distance reference beam path (72, 72a-c) of defined length for calibration of the device with respect to said measuring of absolute distance. ∘ a measurement beam entry area and ∘ at least one receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprising multiple measurement receivers (71r, 9) arranged along a receiver array axis, ∘ for beam detection by a respective measurement receiver (71r, 9) of at least one transmission beam of the plurality of transmission beams returning via the beam entry area and ∘ for measuring of an absolute distance based on a respective detected transmission beam and the principle of time-of-flight, the absolute distance measuring device being characterized in that the laser array (70, 7A, 7B, 7C) comprises at least a first reference laser emitter and the receiver array (71, 6, 6A, 6B, 6C, 60A, 61A, 62A, 60B, 61B, 62B) comprises at least a first reference receiver, the reference laser emitter and reference receiver defining an internal absolute distance reference beam path (72, 72a-c) of defined length for calibration of the device with respect to said measuring of absolute distance.