YSI is a developer and manufacturer of sensors, instruments, software, and data collection platforms for environmental water quality monitoring and testing. Reaching beyond our products, we build relationships with our customers through our dedicated customer service, including technical applications and service support.
The ideal modular system for online wastewater monitoring for 1 to 4 sensors.
Data sonde designed for in situ monitoring and profiling; ideal for long-term deployments requiring a complete water quality data record.
Expand your water quality monitoring to include hydrocarbons, oil or CDOM with YSI Sensor Adapter and Turner Cyclops-7 submersible sensors.
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City of Fairmont, West Virginia WWTP Is Jumping for Joy for Their New DO System 
December, 2011 – You could be the envy of your colleagues if you sign up and win one of the YSI optical dissolved oxygen system giveaways. The City of Fairmont, West Virginia WWTP won the December 2011 drawing and will receive a YSI ProODO® optical DO instrument, ProOBOD...
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Freshwater Institute Helps Protect and Restore Healthy Populations of Salmon 
The Conservation Fund’s Freshwater Institute is benefiting from a donation of technology and expertise from YSI. Freshwater is using the donation to grow healthily populations of salmon and trout on land....
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Other YSI Divisions
YSI ISA - Instrumentos e
Servicios Ambientais
(Latin America)
