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 one with glass electrodes, and showed a prototype at the American Chemical Society meeting in 1935. This example, which measures emf as well as pH, came from the Department of Chemistry at Lehigh University. One metal label reads “BECKMAN / GLASS ELECTRODE METER / BECKMAN INSTRUMENTS, INC. / SOUTH PASADENA, CALIFORNIA, U.S.A. / MODEL M2 / SERIAL 33426.” Another reads “SOLD BY / ARTHUR H. THOMAS CO. / PHILADELPHIA, U.S.A.”
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Chemistry
creditLine: label: Credit Line
content: Gift of Department of Chemistry, Lehigh University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: CH.337148
label: catalog number
content: 337148
label: accession number
content: 1979.0432
objectType: label: Object Name
content: pH Meter
label: Object Name
content: pH meter
physicalDescription: label: Measurements
content: overall: 22.3 cm x 28.5 cm x 26 cm; 8 3/4 in x 11 1/4 in x 10 1/4 in
label: Measurements
content: overall: 8 3/32 in x 10 5/8 in x 9 1/2 in; 20.5486 cm x 26.9875 cm x 24.13 cm