Beckman Model Φ71 pH Meter
- Undated
Shown with bottles of buffers and saturated KCl.
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 Model Φ71 PH Meter,” n.d. Beckman Historical Collection, Box 80. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/0v838067q.
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