Abstract: A method for the determination of the wall thickness or of the wear and tear of the lining of a metallurgical fusion pot with a scanner system for contactless detection of the lining area with determination of the position and orientation of the scanner system and allocation to the position of the fusion pot by the detection of spatial reference points, characterized by the following procedural steps: 1. Definition of a space coordinate system as a reference system (e.g. perpendicular euclidean three-dimensional coordinate system) by means of at least two measuring fixed points 2. Definition of at least two spatial reference points in the reference system and measuring of these reference points with known geodetic methods 3. Measurement of the coordinates of at least two points of the horizontal or rotational axis of the involved metallurgical container in the reference system with known geodetic methods 4.