YSI Hydrodata is a wholly owned subsidiary of YSI Inc, manufacturers of water quality testing and monitoring instruments and systems YSI water quality meters and multiparameter water quality sondes are market leaders all over the world with a reputation for high levels of accuracy and reliability. YSI's water quality measuring instruments are designed for laboratory and field use - for example, a full range of lab test meters are avialable in addition to hand held water quality testing devices that can also be used for testing streams, rivers, reservoirs, boreholes etc. Thousands of YSI multiparameter water quality sondes are in regular use, either as portable measuring instruments, or in a fixed location recording data to the sondes's own internal datalogger. These sondes can be fitted with a wide variety of water quality, level and flow sensors including DO (dissolved oxygen), pH, temperature, turbidity, EC (conductivity), salinity, ORP, chlorophyll, open-channel flow, velocity, vented level, nitrate-nitrogen, ammonium-nitrogen, ammonia, chloride, rhodamine, depth, light, PAR (photosynthetically active radiation). YSI also builds water quality monitoring systems and wireless networks that record data on internal loggers and transmit the water quality data via satellite, gsm, cellphone, or radio. Alternatively, data collection staff can download readings during routine visits to the water quality monitoring station. Water quality sondes can be mounted in the point of greatest water quality interest, such as close to a discharge, on the river or sea bed, or mounted on a buoy for surface water quality measurements.
YSI water quality monitoring sondes are built to a high standard, providing accurate and reliable data. The YSI continuous water quality monitors are currently undergoing evaluation under the MCERTS accreditation scheme.

YSI SonTek is also a member fo the YSI group and complete the water monitoring portfolio with instruments and systems for measuring water velocity, level and flow. YSI SonTek are recognised as world leaders in water velocity measurement. SonTek invented the Acoustic Doppler Velocimeter in 1993, and now offer a comprehensive range of water monitoring instruments including profilers, current meters, velocimeters, river surveyors and wave guage systems, with applications ranging from water monitoring in the laboratory to small streams, and from rivers and reservoirs to coastal and deep ocean installations.

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