6-Series Discontinuation


Best in Class Just Got Better

The tremendous success of the 6-series Sondes pushed the YSI team to take water quality monitoring to a new level.  YSI’s EXO Sondes launched in 2012, bringing significant advancements that ranged from enhanced sensor specifications to best-in-class antifouling.  The 20+ year 6-series technology is now obsolete, so we encourage users to make the transition to the superior EXO line. 

YSI is no longer selling any new 6-Series Sondes; however, we will continue to support the 6-Series product line as much as we can through the end of 2025. Review the full discontinuation and support schedule here.

See all the benefits of upgrading to an EXO sonde.

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Additional Resources

EXO Product Brochure

EXO User Manual

Case Study: On-Line Monitoring of Cyanobacteria in Source Waters


Learn how members of the University of New South Wales used EXO to better monitor cyanobacteria in important local watersheds.