Beckman Model 72 pH Meter


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https://digital.sciencehistory.org/works/765371485
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https://sewiki.info/b/c28ef
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Wikimedia Commons
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Beckman Model 72 pH Meter

The Beckman Instruments Model 72 pH meter was a line operated version of the Model 76 Expanded Scale pH Meter, designed for routine use.

Published without a copyright notice in Beckman Instruments Feedback newsletter, v3 n3, April 1960 (box 44, folder 34)
Licens:
Public domain
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
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