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Digital Collections

Photographs

Beckman Expand-Mate pH Meter

  • Circa 1980

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The name of this pH meter model refers to its expanded measurement scale.

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.

Property Value
Creator of work
Photographer
Format
Genre
Extent
  • 8 in. W x 10 in. L
Inscription
  • (verso) "33 1/2"
  • (verso) "PP03 89"
  • (verso) "B"
  • (lower left corner) "#22B 18 1/2%"
  • (verso) "Armstrong & Associates. 2165 S. Dupont Drive, Suite F. (714) 639-9820. Anaheim, California 92806. 3260-3."
Subject
Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable
Credit line
  • Courtesy of Science History Institute

Institutional location

Department
Collection
Series arrangement
  • Series X. Photographic Materials
  • Sub-series 3. Photo Albums
Physical container
  • Box 79

View collection guide View in library catalog

Related Items

Cite as

Beckman Instruments, Inc. “Beckman Expand-Mate PH Meter,” circa 1980. Beckman Historical Collection, Box 79. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/rj4304553.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.