Falmouth Scientific, Inc. (FSI) is a manufacturer of precision instrumentation for oceanographic applications. Founded in 1989, FSI operates from a 9,000-square-foot state-of-the-art manufacturing facility in Cataumet, Massachusetts, located on Cape Cod.

FSI resources include all necessary environmental and electronic test equipment required for the design, development, and testing of oceanographic sensors and underwater acoustic systems. The facilities include a completely equipped acoustic test tank for performing transducer beam patterns and sensitivity measurements, a pressure chamber, pull-test facility, low- and high- temperature oven, a calibration facility with multiple constant-temperature baths, salinity baths, and precision references and all necessary electronic test equipment.