pH Meter
date: label: Date made
content: ca. 1950
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, and showed a prototype at the American Chemical Society meeting in 1935.
label: Description
content: The inscription on this example reads “Beckman Instruments / pH meter model N / Beckman Instruments, Inc. / Serial no. 215958.” According to advertisements from the 1950s, this model was compact, rugged and portable, and suitable for use in orchards, oil fields, textile mills, mining and mill operations, plating shops, food plants, and laboratories.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Chemistry
creditLine: label: Credit Line
content: Robert P. Huston
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1999.0123.1
label: catalog number
content: 1999.0123.01
label: accession number
content: 1999.0123
objectType: label: Object Name
content: pH Meter
physicalDescription: label: Measurements
content: overall: 12 in x 6 1/4 in x 4 1/4 in; 30.48 cm x 15.875 cm x 10.795 cm
label: Measurements
content: overall: 11 5/8 in x 6 1/4 in x 4 3/8 in; 29.5275 cm x 15.875 cm x 11.1125 cm