This letter to an unidentified person at Beckman Instruments, Inc. describes an omission in the Model G pH meter documentation, which does not include replacing the batteries as a possible fix for a specific problem.
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 “acidimeter” with its glass electrode was renamed the Model G pH meter in 1937 and produced on a larger scale by Beckman’s company, National Technical Laboratories. This instrument kicked off the rapid development not only of NTL and Beckman Instruments, but also of the electronic scientific instrument industry.
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Paules, P. E. “Letter from P. E. Paules to Beckman Instruments,” April 16, 1952. Beckman Historical Collection, Box 18, Folder 25. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/7s75dc40j.
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