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Genre Advertisements Remove constraint Genre: Advertisements Language English Remove constraint Language: English Creator Erwin Wasey, Ruthrauff & Ryan, inc. Remove constraint Creator: Erwin Wasey, Ruthrauff & Ryan, inc. Format Text Remove constraint Format: Text Subject Scientific apparatus and instruments Remove constraint Subject: Scientific apparatus and instruments Subject Hydrogen-ion concentration--Measurement--Instruments Remove constraint Subject: Hydrogen-ion concentration--Measurement--Instruments

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    • 1961

    Advertisement showing a woman using a Beckman Model 76 Expanded Scale 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…