Monochromators, spectrometers, optical systems for spectroscopy | McPherson, McPherson spectrometers, monochromators, spectrographs, and optical systems for science applications at commercial, university and federal research laboratories. high quality optical instruments consistently, for all customers. custom designs and standard products. finished per published specifications or tweaked for specific scientific requirements. Diligence and understanding of our clients' needs built a long record of successful accomplishments.