Profile: Biospherical Instruments, Inc. is a designer and manufacturer of scientific instrumentation for environmental monitoring. Our compact optical profiling systems(C-OPS) is a radiometer system for determining apparent optical properties in shallow-water aquatic systems. Our digital output sensors provide direct serial data connection to a PC for both real-time display and logging. Our logarithmic output sensors are useful for users that acquire their sensor readings through data acquisition system equipped with a limited dynamic range. Our single-channel sensors are used in the laboratory, and deployment with gliders, floats & meteorological stations, and for other marine or terrestrial applications.