43 70th ANNIVERSARY Model 27 Industrial analyzer Measures compounds present in food and beverage, medical research, bioprocessing, and agricultural applications. (Compared here to its contemporary equivalent). 1978 1988 1968 1983 1989 The legacy of our global company reaches back to a three-man partnership forged at Antioch College in Yellow Springs, Ohio, USA. This village, between Dayton and Columbus, still serves as the headquarters for what started as the Yellow Springs Instrument Company. Employee ownership Hardy Trolander, YSI Co-Founder, believed strongly in the social benefits of business and shifted the company ownership to YSI employees. Model 3000 T-L-C METER Measures temperature, level, and conductivity in groundwater, wastewater, and surface water. Model 57 (Japan) YSI goes international with its partnership with Nanotech Japan. TheEarlyYearstothe1980's Model 65 YSI-KETTERING radiometer Developed with the Charles F. Kettering Research Laboratory, primarily used by biologists to measure radiant sun energy. The1990'stothePresent