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Scientific apparatus and instruments, Electronics

Coleman Model 3D pH Meter

  • 1938

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Self contained pH meter with wooden exterior; hinged top door opens to reveal meter face and inlaid paper instructions for use; the double scale reads pH and millivolts; hinged door on left side of wooden case opens to reveal electrode compartment.

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  • Courtesy of Science History Institute

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Science History Institute. Coleman Model 3D PH Meter. Photograph, 2016. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/n870zq908.

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