Beckman φ71 and φ31 pH Meters and φ12 pH/ISE meter
- Undated
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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Cite as
“Beckman φ71 and φ31 PH Meters and φ12 PH/ISE Meter,” n.d. Beckman Historical Collection, Box 81. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/xd07gs856.
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