- A pH meter measures the acidity of aqueous solutions. When asked about an instrument suitable for testing citrus fruit, Arnold Beckman, a young chemist at the California Institute of Technology, designed one with glass electrodes, and showed a prototype at the American Chemical Society meeting in 1935. He established the National Technical Laboratories in Pasadena in 1935, to manufacture this instrument. The firm became Arnold O. Beckman, Inc. in the 1940s, and Beckman Instruments, Inc. in the 1950s.
- An oval tag inside the lid of this example reads “BECKMAN” and “MODEL G SER 9567 GLASS ELECTRODE pH METER NATIONAL TECHNICAL LABORATORIES SOUTH PASADENA, CALIFORNIA, U.S.A.” The Model G was introduced in 1937, and still in production twenty years later.
- Currently not on view
- Object Name
- pH Meter
- Date made
- ca. 1958
- National Technical Laboratories
- place made
- United States: California, Pasadena
- Associated Place
- United States: New Jersey
- overall: 28 cm x 28.6 cm x 22.2 cm; 11 in x 11 1/4 in x 8 3/4 in
- overall: 10 7/8 in x 11 1/8 in x 8 1/4 in; 27.6225 cm x 28.2575 cm x 20.955 cm
- ID Number
- catalog number
- accession number
- Credit Line
- Gift of Beckman Instruments
- See more items in
- Medicine and Science: Chemistry
- Data Source
- National Museum of American History
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