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Creator Armstrong & Hess Remove constraint Creator: Armstrong & Hess Creator Beckman Instruments, inc. Remove constraint Creator: Beckman Instruments, inc. Format Image Remove constraint Format: Image

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    • circa 1980

    The name of this pH meter model refers to its expanded measurement scale.

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way…