YSI (Xylem)

YSI Incorporated, a Xylem brand headquartered in Yellow Springs, Ohio, has been a leading manufacturer of water quality monitoring instrumentation for over 70 years. The company designs and produces multiparameter sondes, portable meters, laboratory instruments, online process monitors, autonomous survey vehicles, and data management platforms for environmental, municipal, and industrial water applications. YSI's flagship EXO2 sonde features seven sensor ports including a central wiper for long-term deployment monitoring of parameters such as dissolved oxygen, conductivity, pH, turbidity, chlorophyll, and blue-green algae. The ProDSS handheld provides portable digital measurement of up to 20 water quality parameters, while the ProQuatro and ProSolo serve as more focused portable instruments for field sampling. In the laboratory, the MultiLab Pro series offers two-channel and four-channel benchtop instruments with wireless IDS sensor connectivity and GxP-compliant measurement capability. For continuous process monitoring, YSI's IQ SensorNet 2020 3G controller supports modular sensor networks measuring up to 20 parameters, complemented by the Alyza phosphate analyzer, ColorVis spectrophotometer, 9220 TOC analyzer, and THM 1000 VOC monitor. The company also produces autonomous survey platforms including the Surfbee autonomous surface vehicle and the EcoMapper Nano AUV, along with fixed monitoring infrastructure such as pontoon vertical profiling systems, the HydroRIG remote data gateway, and the HydroSphere data visualization platform.