McPherson, Inc. manufactures Instruments and Systems for Spectroscopy and Spectrophotometry through the optical electromagnetic spectrum. We design and build tools to measure frequency and intensity of light wavelengths / rays with good spectral resolution over a wide free range. McPherson instruments are used in physics research, physical chemistry and astronomy in applications through the X Ray, Vacuum, UV, Visible and Infrared (IR, including MWIR and LWIR) wavelengths. Vacuum and ultra high vacuum (UHV) models are available in most designs.