OE 750 Seamless quality control is essential for any metalworking, starting with tramp element analysis for scrap, inspection of in-coming materials, QA / QC in the foundry process and goods issue. Optical Emission Spectroscopy, or OES, is a well trusted and widely used analytical technique used to determine the elemental composition of a broad range of metals. Our stationary optical emission spectrometers offer the highest levels of accuracy and precision of the analytical results. A powerful yet easy-to-use software package covers almost every application.