pH Meter
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. The “Beckman / EXPANDOMATIC” inscription refers to a model introduced in 1964.
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 Worcester Foundation for Experimental Biology, Inc. (through Thoru Pederson)
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1991.0892.04
label: catalog number
content: 1991.0892.04
label: accession number
content: 1991.0892
objectType: label: Object Name
content: pH Meter
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: glass (overall material)
label: Measurements
content: overall: 30.5 cm x 31.7 cm x 21.6 cm; 12 in x 12 1/2 in x 8 1/2 in
label: Measurements
content: overall: 8 1/2 in x 11 7/8 in x 12 1/4 in; 21.59 cm x 30.1625 cm x 31.115 cm