Advertisement for the Beckman Blood pH System, including the Model 76 Expanded Scale pH Meter, Thermomatic Constant Temperature Block, and Micro Blood pH Assembly.
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. “Accurate, Readable, Repeatable Blood PH,” 1962. Beckman Historical Collection, Box 49, Folder 20. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1v53jw97x.
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