Abstract: The invention relates to a device for the optoelectronic determination of the length (1) and/or the width (2) of a body (4) situated on a support (3), comprising a first linear guide (5) for determining the length (1) of the body and/or a second linear guide (6) for determining the width (2) of the body (4). Said first (5) and/or said second linear guide (6) can be moved along the support (3) in the longitudinal and/or transversal direction of the same, and each has at least one optoelectronic probe (7). The probe heads (7) are connected to an evaluation device (8) in such a way that the signals can be transmitted, said evaluation device converting and displaying the electrical signal emitted by the probe heads (7) into the length (1) and/or the width (2) of the body (4).