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Creator Coleman Electric Co. (Maywood, Ill.) Remove constraint Creator: Coleman Electric Co. (Maywood, Ill.) Subject Hydrogen-ion concentration--Measurement--Instruments Remove constraint Subject: Hydrogen-ion concentration--Measurement--Instruments

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    • 1938

    Self contained pH meter with wooden exterior; hinged top door opens to reveal meter face and inlaid paper instructions for use; the double scale reads pH and millivolts; hinged door on left side of wooden case opens to…