pH Meter
date: label: Date made
content: ca. 1958
name: label: maker
content: National Technical Laboratories
notes: label: Description
content: 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.
label: Description
content: 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.
label: Location
content: Currently not on view
place: label: place made
content: United States: California, Pasadena
setName: label: See more items in
content: Medicine and Science: Chemistry
creditLine: label: Credit Line
content: Gift of Beckman Instruments
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1981.0816.2
label: catalog number
content: 1981.0816.2
label: accession number
content: 1981.0816
objectType: label: Object Name
content: pH Meter
physicalDescription: label: Measurements
content: overall: 28 cm x 28.6 cm x 22.2 cm; 11 in x 11 1/4 in x 8 3/4 in
label: Measurements
content: 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