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Place California--South Pasadena Remove constraint Place: California--South Pasadena Format Image Remove constraint Format: Image Subject Hydrogen-ion concentration--Measurement--Instruments Remove constraint Subject: Hydrogen-ion concentration--Measurement--Instruments Date 1950 Remove constraint Date: <span class='single'>1950</span>

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    • Bulletin 170
    • circa 1950

    Promotional, color pamphlet for the Model H pH Meter.

    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 to measure the…

    • 1950s

    The advertisement touts the features of Beckman glass electrodes and the company's position in the instrumentation field.

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the…

    • Bulletin 168-B
    • 1950-Oct

    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 to measure the acidity of his product. The resulting instrument kicked off…

    • 1950-Apr

    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 to measure the acidity of his product. The resulting instrument kicked off…