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Direct reading pH meter

1950-1970

pH meter by E.I.L. model 38B

1960-1970

PH meter by Cambridge Instrument Co. Ltd [Patent No.396817, Serial No. L-322992].

PH meter by Cambridge Instrument Co. Ltd

1930-1950

PH meter by Doran Instrument Co. Ltd., Stroud, Gloucester [Patent No. 593920, Serial No 3533], with notes and manual

PH meter by Doran Instrument Co. Ltd.

1940-1960