For more than 25 years, AquaCalc LLC—formerly JBS Instruments—has designed and manufactured portable stream-flow computers that automate open-channel discharge measurements for hydrologists and field technicians. Managed from Sacramento, the company’s AquaCalc Pro Plus works with mechanical current meters, calculates discharge in the field, and transfers measurements to computers through its DataLink software. Its instruments are used by the U.S. Geological Survey and hydrographers worldwide.
RoHS compliant
Compliance program
Performance Results Plus, IncPerformance Results Plus, Inc. manufactures and distributes hydrological instrumentation built to U.S. Geological Survey designs and standards, including equipment for accurate water measurement and sediment sampling. Based in Columbus, the company has produced USGS hydrologic instrumentation for more than 100 years and also offers custom-designed equipment through its engineering staff. Its factory-authorized service operation evaluates, repairs, calibrates, and certifies instruments to help preserve measurement accuracy.GALENA, OH
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
Gurley Precision Instruments, IncFounded in 1845, Troy-based Gurley Precision Instruments makes measurement equipment spanning optical encoders, precision optics, materials-testing instruments and open-channel flow meters. Its hydrological work dates to 1885, while its Genuine Gurley paper-testing instruments have been made since 1923, giving the company an unusually deep history in specialized measurement. Gurley is ISO 9001:2015 certified and continues to develop custom equipment for OEM, industrial, military and aerospace applications.TROY, NY
H2flow Controls, IncFrom its base in Sylvania, Ohio, H2flow Controls manufactures equipment that controls, protects and measures electric-motor-driven machines and processes, including flow meters and motor-control systems. Founded in 1999, the privately owned company serves customers through a network of distributors and sales representatives in more than 60 countries. Its FlowVis meter is NSF 50 Level 1 certified, while the AcuFlow line is manufactured in the United States for clean, gray and potable water applications.TOLEDO, OH