The invention relates to a measuring system for elongated objects, in particular tree trunks, with a measuring device arranged on the path of a continuous transport installation with at least one transmitter and receiver arrangement and graduations extending between them which pass in the arrangement of the transmitter and the receiver which are arranged face-to-face, on both sides of the transport device and with a horizontal guideway for the coaches receiving the objects to be measured and, where appropriate, a transport member, which at least partially extend beyond the measuring plane. BR/ According to the invention, a surface (39) or a guide surface of the guideway section (42) receiving the guideway (26) has, in the measurement plane (10), a plus small dimension in cross section only in planes parallel and adjacent to the measurement plane of the guide voice or with a mutual offset with respect thereto. BR/ The invention applies in particular to diameter measurements. / P
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