Abstract: Device and method for performing a measurement of at least one geometrical dimension of an object, where: a reference model of the object is acquired; the object is gripped by gripping elements (5) and a first image of the object is taken via optical elements (2); the object is translated and rotated in the three dimension by the gripping elements while images of the object are taken by the optical elements (2) until reaching a condition representative of the superimposition of the perimeter of the image of the object or of a portion of it with those of the reference model; then the measurement of the geometrical dimension is performed.