An apparatus for measuring a moving surface, characterized in that the apparatus comprises at least three first transceivers (100 to 104; 200 to 206), which are distributed two-dimensionally in space, said at least three first transceivers (100 to 104; 200 to 206) being configured to interact with the surface in a contactless manner using a microwave range of electromagnetic signals and configured to receive microwave signals of the interaction with information relating to distances between the at least three transducers (100 to 104; 200 to 206) and the surface as a reflection; the at least three first transceivers (100 to 104; 200 to 206) comprises at least two first transceivers (100 to 104), which are distributed parallel with a longitudinal extent of a surface of a first edge of a sheet; the at least two first transceivers (100 to 104) are configured have the interaction with the surface of the first edge in the contactless manner using the microwave range of the electromagnetic signals; the at least two first transceivers (100 to 104) are configured to receive at least two of the microwave signals of the interaction with information relating to distances between the at least two first transceivers (100 to 104) and the first edge at different longitudinal sections (14, 16) of the sheet, the microwave signals of the interaction representing both dimensions of the space of two-dimensional distribution of the at least three first transceivers (100 to 104; 200 to 206); and a data processing unit configured to receive the information, and determine at least one geometrical parameter of the first edge based on the information. at least three first transceivers (100 to 104; 200 to 206), which are distributed two-dimensionally in space, said at least three first transceivers (100 to 104; 200 to 206) being configured to interact with the surface in a contactless manner using a microwave range of electromagnetic signals and configured to receive microwave signals of the interaction with information relating to distances between the at least three transducers (100 to 104; 200 to 206) and the surface as a reflection; the at least three first transceivers (100 to 104; 200 to 206) comprises at least two first transceivers (100 to 104), which are distributed parallel with a longitudinal extent of a surface of a first edge of a sheet; the at least two first transceivers (100 to 104) are configured have the interaction with the surface of the first edge in the contactless manner using the microwave range of the electromagnetic signals; the at least two first transceivers (100 to 104) are configured to receive at least two of the microwave signals of the interaction with information relating to distances between the at least two first transceivers (100 to 104) and the first edge at different longitudinal sections (14, 16) of the sheet, the microwave signals of the interaction representing both dimensions of the space of two-dimensional distribution of the at least three first transceivers (100 to 104; 200 to 206); and a data processing unit configured to receive the information, and determine at least one geometrical parameter of the first edge based on the information.