A method and an apparatus for transmitting a 3D model associated to stereoscopic content are described, and more specifically a method and an apparatus for the progressive transmission of 3D models. In particular, each product, after weighing, can be carried along from a presenting element for further transport. The apparatus includes a first arm that is configured and arranged so as to support a distal portion of the penetrating member and a first drive mechanism that is coupled to the first arm.