YSI is the maker of environmental, laboratory, and municipal monitoring instruments, sensors, software, systems, and data collection platforms for water quality monitoring and testing, water velocity data, and more. Measure with confidence! Analytics for decision. Our multiparameter instruments, aquaculture monitoring systems, handheld sampling instruments, and complete line of SonTek (velocity) products can be incorporated into any of your monitoring or sampling applications. Our instruments have the ability to be used in the field or the lab, and can even be used in unattended settings. We build long-lasting relationships with our customers through our dedicated customer service, including technical applications and service support by field-tested experts. And our innovative technology is derived through environmentally responsible business practices. YSI works with professionals to develop water monitoring solutions for our planets natural resources. Whether you are concerned with climate change, floods, droughts, storm water runoff, clean drinking water, healthy ecosystems or fish, we can partner with you to provide reliable water resource instruments and systems. Here are some of the many market applications and parameters YSI provides innovative, industry-leading solutions. Aquaculture Coastal Desalination Estuary Drinking Water Groundwater Laboratory Oceans Raw Water Source Water Storm Water Surface Water Wastewater Watersheds YSI is now part of Xylem Inc. Learn more at www.xyleminc.com.