Response to an earlier letter from Dr. Duschak, asking if Dr. Beckman's new "acidimeter" would be appropriate for determining the pH of vegetable juices. Beckman describes some of the recent changes to the instrument, leading to the model that will soon go on the market.
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, Arnold O. “Letter from Arnold O. Beckman to L. H. Duschak,” April 30, 1935. Beckman Historical Collection, Box 14, Folder 8. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/k930bx099.
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