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.
Easy to use, dissolved oxygen, conductivity, salinity handheld for the field.
The ideal modular system for continuous online wastewater process monitoring and control.
ProOBOD Self-Stirring Optical BOD Probe
The ProOBOD® self-stirring optical BOD probes are designed to be used with the ProODO instrument.
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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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YSI ISA - Instrumentos e
Servicios Ambientais
(Latin America)
