Biospherical Instruments Inc. (BSI) is a research-oriented company founded in 1977 to design and manufacture scientific instrumentation for environmental monitoring. The company also has a long involvement with environmental monitoring, from the Antarctic and Arctic, to municipal drinking water reservoirs. Since its inception more than three decades ago, BSI has broadened its product line and established an international reputation as a leading manufacturer of high quality optical instruments for the oceanographic, atmospheric, water quality, and biological sciences communities. BSI’s products include terrestrial and oceanographic global UV monitoring systems, water quality monitoring systems for municipal reservoirs, and a wide variety of UV and visible wavelength radiometers for use in oceanographic and atmospheric research.