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Scientific apparatus and instruments, Electronics

Beckman Model M pH Meter

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Wooden box with handle at top and metal latch closure at front; interior: instructions for use printed on paper and inset into box lid; top face: window at center reveals pH scale "7-14" and millivolts "0-400"; control knobs for "AP" and "STD" at right and left; power switch at bottom center of face; compartment for electrode (attached) at right.

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  • 24.1 cm H x 34.9 cm W x 24.1 cm D
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Rights Creative Commons Attribution 4.0 International License
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  • Courtesy of Science History Institute

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Science History Institute. Beckman Model M PH Meter. Photograph, 2016. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h702q6471.

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