Since 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.
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AquaPhoenix ScientificAquaPhoenix Scientific brings water testing and chemical management together, manufacturing reagents and test kits while building feed-and-control equipment at its Hanover, Pennsylvania facility. Its in-house chemists and engineering team also develop customer-specific formulations, private-label products, and custom control panels, giving the company a distinctly hands-on role from testing through treatment. Manufacturing is supported by an ISO 9001:2015-certified quality management system and continuous-improvement practices.HANOVER, PA
Kuntze InstrumentsKuntze Instruments is a third-generation, family-owned German company founded in Düsseldorf in 1945, with more than 75 years devoted to water-quality engineering. Its sensors are made, calibrated, and tested in-house at a dedicated facility in Hartha, while Kuntze USA provides local support for North American water-treatment operators. The company is known for bringing German-built measurement expertise to demanding water systems.LOWER BURRELL, PA
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
LaMotte CompanyFounded in Baltimore in October 1919, LaMotte Company makes portable and laboratory water-analysis equipment for professionals, educators, and homeowners. Frank L. LaMotte began with the first domestically produced pH test kits, and the company has since developed technologies including DPD chlorine testing, electronic colorimeters, and Spin Touch systems. Based in Maryland with expanded manufacturing and R&D capacity in Delaware, LaMotte serves more than 75 countries across applications ranging from drinking water and wastewater to pools and aquaculture.CHESTERTOWN, MD