Close-up view of a Companion pH meter manufactured and sold by Coleman Instruments, Inc.
|Original file type||TIFF|
|View in library catalog|
Gordon Carson Photography. “Coleman Companion PH Meter,” 1960–1969. Photographs from the Perkin-Elmer-Applera Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h702q717h.
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