A survey instrument comprising a single point measurement unit, a point cloud measuring module, and a computing unit, wherein - the single point measurement unit is configured to generate first measurement data comprising a distance, an elevation angle, and an azimuth angle of a single point, - the point cloud measuring module o has a fixed pose relative to the single point measurement unit, and o is configured to generate, by scanning a setting, second measurement data comprising coordinates of a plurality of scan points, - the computing unit stores calibration parameters comprising the fixed pose between the single point measurement unit and the point cloud measuring module, wherein the survey instrument is configured to execute a calibration functionality, wherein the calibration functionality comprises the automatic execution of - acquiring, by the point cloud measuring module, the second measurement data as a calibration point cloud, - identifying, by the computing unit, at least two non-parallel object edges (140,150) in the calibration point cloud, wherein the object edges (140,150) are defined by a respective first flat surface (141,151) and a respective second flat surface (142,152), characterized in that the calibration functionality further comprises the automatic execution of: - for each of the at least two object edges (140,150): ∘ scanning, by the single point measurement unit, across the object edge (140,150), wherein a set of single measuring points including at least two points on each of the flat surfaces (141,142,151,152) of the object edge (140,150) is acquired, the single measuring points laying on a straight-line scan-path, o deriving, by the computing unit, a vertex formed by the distribution of the single measuring points, the vertex corresponding to the object edge (140,150), - updating, by the computing unit, the calibration parameters based on the alignment of the object edges and the derived vertices. - the single point measurement unit is configured to generate first measurement data comprising a distance, an elevation angle, and an azimuth angle of a single point, - the point cloud measuring module o has a fixed pose relative to the single point measurement unit, and o is configured to generate, by scanning a setting, second measurement data comprising coordinates of a plurality of scan points, o has a fixed pose relative to the single point measurement unit, and o is configured to generate, by scanning a setting, second measurement data comprising coordinates of a plurality of scan points, - the computing unit stores calibration parameters comprising the fixed pose between the single point measurement unit and the point cloud measuring module, the survey instrument is configured to execute a calibration functionality, wherein the calibration functionality comprises the automatic execution of - acquiring, by the point cloud measuring module, the second measurement data as a calibration point cloud, - identifying, by the computing unit, at least two non-parallel object edges (140,150) in the calibration point cloud, wherein the object edges (140,150) are defined by a respective first flat surface (141,151) and a respective second flat surface (142,152), - acquiring, by the point cloud measuring module, the second measurement data as a calibration point cloud, - identifying, by the computing unit, at least two non-parallel object edges (140,150) in the calibration point cloud, wherein the object edges (140,150) are defined by a respective first flat surface (141,151) and a respective second flat surface (142,152), characterized in that the calibration functionality further comprises the automatic execution of: - for each of the at least two object edges (140,150): ∘ scanning, by the single point measurement unit, across the object edge (140,150), wherein a set of single measuring points including at least two points on each of the flat surfaces (141,142,151,152) of the object edge (140,150) is acquired, the single measuring points laying on a straight-line scan-path, o deriving, by the computing unit, a vertex formed by the distribution of the single measuring points, the vertex corresponding to the object edge (140,150), - updating, by the computing unit, the calibration parameters based on the alignment of the object edges and the derived vertices. - for each of the at least two object edges (140,150): ∘ scanning, by the single point measurement unit, across the object edge (140,150), wherein a set of single measuring points including at least two points on each of the flat surfaces (141,142,151,152) of the object edge (140,150) is acquired, the single measuring points laying on a straight-line scan-path, o deriving, by the computing unit, a vertex formed by the distribution of the single measuring points, the vertex corresponding to the object edge (140,150), ∘ scanning, by the single point measurement unit, across the object edge (140,150), wherein a set of single measuring points including at least two points on each of the flat surfaces (141,142,151,152) of the object edge (140,150) is acquired, the single measuring points laying on a straight-line scan-path, o deriving, by the computing unit, a vertex formed by the distribution of the single measuring points, the vertex corresponding to the object edge (140,150), - updating, by the computing unit, the calibration parameters based on the alignment of the object edges and the derived vertices.