Founded by Vincent Kelly in 2006, Green Eyes, LLC develops scientific instruments and automated systems for real-time surface-water monitoring, with a particular focus on high-frequency nutrient data. Its equipment grew from Kelly’s University of Maryland environmental research and includes the NuLAB automated nutrient analyzer, along with tools for sampling, sediment erodibility measurement and sensor biofouling control. Green Eyes was acquired by SePRO Corporation in April 2025, while Kelly continues as technical development manager.
Brightwaters Instrument CorporationFounded in 1990, Brightwaters Instrument Corporation builds custom and semicustom scientific and oceanographic equipment, including autonomous drifting buoys, and provides OEM design and manufacturing services. The privately held New York company specializes in systems that combine environmental sensing with GPS and satellite telemetry, serving government, university, and private-sector research programs. Its support extends beyond delivery with around-the-clock field assistance, equipment repair, and refurbishment for instruments used at sea.BRIGHTWATERS, NY
Bay Instruments, LLCEstablished in 2000, Bay Instruments, LLC builds and supplies membrane inlet mass spectrometers for rapid, high-precision measurement of dissolved gases in environmental water. Its niche is the N2/Ar method used in aquatic denitrification research, backed by more than 30 years of MIMS expertise and instruments operating at universities and research facilities in 14 countries. The company also adapts its systems for applications such as photosynthesis and trace-gas analysis while providing specialized inlets and hands-on application assistance.EASTON, MD
Apera Instruments, LLCSince 1991, Apera Instruments has designed and manufactured electrochemical sensors and meters that help users measure water quality, with its specialty extending from pocket testers to laboratory instruments. The company makes key components in-house, particularly its electrodes, and operates an ISO 9001:2015-certified manufacturing facility; its products are used in more than 60 countries. Apera serves everyone from researchers to hobbyist growers, including with instruments tailored to challenging samples such as pure water, viscous liquids, and high-salinity solutions.COLUMBUS, OH
YSI IncorporatedBorn from a three-man partnership at Antioch College, YSI Incorporated has been part of Yellow Springs, Ohio, since its founding in 1948. Now a Xylem Analytics brand, it is known for applying sensor technology to help environmental and industrial professionals understand water conditions, with a history that also includes pioneering life-science instruments. Its quality system is registered to ISO 9001, ISO 14001, and ISO 13485.YELLOW SPRINGS, OH