Advertisement showing a woman using a Beckman Model 76 Expanded Scale pH Meter.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry.
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Beckman Instruments, and Ruthrauff Erwin Wasey. “Read PH to 0.003...,” 1961. Beckman Historical Collection, Box 49, Folder 19. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/12579s25t.
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