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Genre Documents Remove constraint Genre: Documents Place California--South Pasadena Remove constraint Place: California--South Pasadena Format Image Remove constraint Format: Image Date 1950 Remove constraint Date: <span class='single'>1950</span>

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    • 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…