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One Beckman Model G pH meter & electrode

Marconi pH meter

PYE pH meter

Cambridge Instrument Company Ltd PH meter

1950

Cambridge pH meter, serial no. 24871

Cambridge Instrument Co. Ltd. pH meter

Expandomatic pH meter by Beckman

1970

Cambridge pH meter

1960

PH meter

1950

Pye model 79 pH meter

pH meter

pH meter type D-303-B/C

Pye pH meter, model 78, 1969

1969

Open University pH meter and probe

1990-1996

Cambridge bench pH meter serial no. L334784

1940-1949

pH Meter `Zeromatic'. Serial no.1477

1900-1980
pH meter, with electrodes, by Doran Instrument Co. Ltd., Stroud

pH meter

1950-1980
pH meter type D-303-B with spare dip electrode made by Muirhead and Co. Ltd., Beckenham, Kent, 1940-1950

pH meter type D-303-B with spare dip electrode made by Muirhead and Co. Ltd.

1940-1950
Collection of instruments (pH meters etc) made by Electronic Instruments Ltd (E.I.L) 1946-1965 (60 items)

Collection of instruments made by Electronic Instruments Ltd

1946-1965
PH meter by Cambridge Instrument Company, 1936, used by Imperial Chemical Industries Ltd - Pharmaceutical division.

Cambridge Instrument Company PH meter

1936
pH Meter 27

pH Meter 27

1900-1980
pH Meter Type TF 717. No.R2609 dated 6.7.50

pH Meter Type TF 717. No.R2609 dated 6.7.50

1900-1980
PH meter by Cambridge Instrument Co., with accessories

PH meter by Cambridge Instrument Co

Model 23A Direct reading pH meter used to monitor the pH of media -in organ or tissue culture at the Common Cold Research Unit, 1961-1980

Model 23A Direct reading pH meter used to monitor the pH of media

Pye-Unicam 292 MKII pH meter with attached Electrode, Serial No. 114565.

Pye-Unicam 292 MKII pH meter with attached Electrode

Radiometer PHM61 pH meter, serial no. 224006, 1980s.

Radiometer PHM61 pH meter

1980-1989
Pye pH meter (cat no. 11070) c. 1961

Pye pH meter (cat no. 11070) c. 1961

1961
Cambridge Instrument Company pH meter patent no.396817, serial no. L.330947, with maker's test certificate dated 31 December 1956 and instruction book

Cambridge Instrument Company pH meter patent no.396817

1956
Hand-held pH meter, ion selective field effect transistor (ISFET) type, model KS501, with sales leaflet, by Camlab Limited, Cambridge, England, 1997.

Portable Camlab pH Meter, 1997

1997
Portable pH meter with accessories, ion selective electrode (ISE type), for fluoride measurement, by the Hach company, c. 1990. Model no.45400, serial no. 921000000784.

Portable pH Meter, 1985-1995

1985-1995
Pye "Dynocap", pH meter-millivoltmeter with accessories, by Pye Unicam, Cambridge, 1960-1962

Pye "Dynocap"

PH meter, type TF 717 A/M made by Marconi Instruments Ltd., (serial no 7234 184), mains operated, c. 1950

PH meter

1950
pH meter, in mahogany case BY Doran Instrument Co. Ltd., Stroud, Glos., England, 1957. British patent no.593920

pH meter

1957
PH meter by Marconi Instruments

PH meter by Marconi Instruments

pH meter type D-449-A, no. 152936, by Muirhead and Co. Ltd., patent 581270, February 1948, with electrodes and tray

pH meter type D-449-A, with electrodes and tray

1948