42 70th ANNIVERSARY 1948 1960 1964 1963 1955 Commercial Electrodes Dr. Leland Clark, researcher at Fels, partnered with YSI co-founders. He is best known for developing the Clark oxygen electrode that allows dissolved oxygen to be measured in liquids. Small Beginnings YSI founded in Yellow Springs, Ohio in the basement of Antioch College by three alumni. Yellow Springs still serves as our global headquarters. HUFFY RADIO BIKE One of YSI's first instruments in the mid-50's was an integrated radio for Huffy bikes. Believe it or not, the Huffy radio bike was not the contract that put Yellow Springs Instrument Company on the map. Model 80 Laboratory recorder Compact, affordable recorder for labs and high schools. The first instrument to meet the needs of researchers, industries and students. Model 51 Oxygen meter The first portable, on-the-spot instrument to measure dissolved oxygen and temperature, featuring the Clark electrode. 70 YEARS of INNOVATION