A rolling mill processes profiled steel in reversing operation. The raw blocks need to be heated to a rolling temperature of approx. 1200°C. After the still hot rods leave the finishing stand, an optoNCDT 1700-750BL laser triangulation sensor with a blue laser diode checks the dimensional accuracy of the profiles. The rod centre is measured with a material speed of up to 10 m/s. The high sensor resolution ensures continuous checks of defect-free surfaces. The optoNCDT1700-750BL with a blue laser diode provides reliable measurements for red-hot glowing objects. Its fine-tuned optical filters block the object's intrinsic radiation. The extensive measuring range means that no intricate sensor adjustments are required for new rolled products.