In this memo, Walter Donner discussed the color and material to be used for the Zeromatic's case.
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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Donner, Walter. “Memo from Walter Donner to Beckman Instruments Staff,” September 26, 1956. Beckman Historical Collection, Box 18, Folder 23. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/p8418n72b.
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