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How to Measure Soil pH

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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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  • 3.75 in. W x 7.75 in. L
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  • (front, top left) "1159"
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  • Danaher Corporation
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  • Courtesy of Science History Institute

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  • Series XIV. Instructions and Manuals
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  • Box 107, Folder 115

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Beckman Instruments, Inc. “How to Measure Soil PH,” n.d. Beckman Historical Collection, Box 107, Folder 115. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1z40kt57d.

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