About YSI

YSI was founded on the spirit of innovation. The burning desire to solve a problem, develop a solution, and change the world is woven into the fabric of YSI and our team.

It all started in Yellow Springs, Ohio in 1948. In the beginning, two engineers, Hardy Trolander and John Benedict, embraced their entrepreneurial side, setting out to solve the problems of the day through the application of good science. They were joined by chemist David Jones.

We work with industry and government professionals to provide monitoring and sampling solutions for process improvement and to protect our planet's natural resources.

About YSI

Thornton Creek Restoration | Urban Watershed

December 04, 2018

A wilderness teems just out of sight in rivers, actually below the rivers in the saturated soils,...

About YSI

Who's Minding the Planet? The Story of YSI Part 1

January 30, 2018

YSI turned 60 in 2008. The Story of YSI is a two-part video series to celebrate who we were at...

About YSI

Who's Minding the Planet? The Story of YSI Part 2

January 30, 2018

YSI turned 60 in 2008. The Story of YSI is a two-part video series to celebrate who we were at...

About YSI

YSI Professional Series Water Quality Meters:...

January 04, 2018

YSI Professional Series water quality instruments are smart, tough, and versatile. This Mac vs...

About YSI

YSI Professional Series Water Quality Meters:...

January 04, 2018

YSI Professional Series water quality instruments are smart, tough, and versatile. This Mac vs...

About YSI

YSI Professional Series Water Quality Meters:...

January 04, 2018

YSI Professional Series water quality instruments are smart, tough, and versatile. This Mac vs...