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Genre Advertisements Remove constraint Genre: Advertisements Language English Remove constraint Language: English Place California--Pasadena Remove constraint Place: California--Pasadena Format Text Remove constraint Format: Text

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    • Bulletin No. 17
    • 1935 – 1940

    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…