YSI Inc

YSI got its start in 1948 as Yellow Springs Instruments when Hardy Trolander, Dave Case and a few other engineers came up with mechanical timers and sensors for researchers at Wright Air Field, the predecessor to Wright-Patterson Air Force Base. Today, the company is in Yellow Springs, OH, and serves two major markets: environmental and life sciences. The environmental division produces sensors and software to test water quality and velocity of natural resources such as rivers, oceans, surface and groundwater. The life sciences division makes analyzers for clinical and industrial purposes. YSI became a part of Xylem in 2011.

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