This advertisements shows off the range of Beckman Instruments' pH meters available in 1957, highlighting the variety of size and price.
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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Charles Bowes Advertising, and Beckman Instruments. “PH Means Beckman,” 1957. Beckman Historical Collection, Box 49, Folder 14. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2r36tx526.
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