This advertisement highlights uses for Models R, H, and M pH meters in the water and wastewater treatment industry.
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.
|View in library catalog|
Beckman Instruments. “Important Facts About PH for Water & Sewage Operators,” 1950–1959. Beckman Historical Collection, Box 18, Folder 30. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mk61rh49w.
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