Welcome to YSI Hydrodata
Located in Letchworth, UK, YSI Hydrodata distributes YSI and SonTek instruments and monitoring systems, providing training, installation, service, repair and calibration support services in addition to a full range of rental products. We are a division of YSI Incorporated, a global business committed to sustaining the quality and viability of the Earth's water resources with the world's most accurate and reliable water quality and hydrology measurement technologies.
Featured Applications
YSI and SonTek provide a complete range of robust instrumentation, designed specifically to operate in dynamic, brackish environments.
Dredging can have a significant affect on water quality, lifting pollutants and suspended solids into the water column.
YSI monitoring instruments can be deployed to demonstrate compliance with regulations covering discharges to the environment.
News Updates
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Water Quality is key to the success of Cardiff Bay Restoration 
Water quality has been a central theme in a redevelopment project that began with the creation of the Cardiff Bay Development Corporation in 1897....
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New CTD Monitoring Technology Helps Reveal Arctic Secrets 
A group of Arctic researchers has employed the latest monitoring technology to investigate the effects of climate change, by measuring temperature and salinity in the water column beneath surface ice....
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Other YSI Divisions
YSI ISA - Instrumentos e
Servicios Ambientais
(Latin America)
Rental Specials
Its now possible to expand your water quality monitoring to include hydrocarbons or oil with the YSI Sensor Adapter. The YSI Sensor Adapter expands water quality monitoring to include third-party...
Remote boat...
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Event Calendar