pH Meter
name: label: maker
content: Beckman Instruments
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 pH meter with glass electrodes. He showed a prototype at the American Chemical Society meeting in 1935, and then established the National Technical Laboratories in Pasadena. The firm became Arnold O. Beckman, Inc. in the 1940s, and Beckman Instruments, Inc. in the 1950s.
label: Description
content: The inscription on top of this example reads “BECKMAN pH METER / MODEL G.” This model was introduced in 1935, and proved remarkably popular.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Chemistry
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1994.0019.43
label: accession number
content: 1994.0019
label: catalog number
content: 1994.0019.43
objectType: label: Object Name
content: pH Meter
physicalDescription: label: Measurements
content: overall: 10 1/4 in x 11 1/4 in x 8 1/4 in; 26.035 cm x 28.575 cm x 20.955 cm
label: Measurements
content: overall: 10 7/8 in x 11 5/16 in x 8 3/4 in; 27.6225 cm x 28.73375 cm x 22.225 cm