Abstract: The invention relates to a contactless system for measuring centricity and diameter, comprising i) an optical measuring device (13, 13?, 14, 14?) for determining the external diameter and the position of a cable (3) on an optical, perpendicular plane that runs transversally to the central axis Z of a measuring device (2), whereby said cable (3) has a conductor (4) and a jacket (5) that insulates said conductor and is pulled through the measuring device (2) along the central axis Z, ii) an inductive measuring coil device (1) for determining the position of the conductor (3) on an inductive measuring plane, which is likewise perpendicular and runs transversally to the central axis Z of the measuring device (2), and iii) means, which correlate the position of the cable (3), determined by the optical measuring device (1) with the position of the conductor (4), calculated by the inductive measuring coil device (1) and which calculate the centricity of the conductor (4) in the jacket (5) from said correlation.