PH meter (English Wikipedia)

"pH meter". Encyclopædia Britannica Online. 2016. Retrieved 10 March 2016.
Bell, Ronald Percy. "Acid-Base Reaction". Encyclopaedia Britannica. Encyclopaedia Britannica, Inc. Retrieved 21 March 2017.

cam.ac.uk

AK Yetisen; H Butt; F da Cruz Vasconcellos; Y Montelongo; CAB Davidson; J Blyth; JB Carmody; S Vignolini; U Steiner; JJ Baumberg; TD Wilkinson; CR Lowe (2013). "Light-Directed Writing of Chemically Tunable Narrow-Band Holographic Sensors". Advanced Optical Materials. 2 (3): 250. doi:10.1002/adom.201300375. S2CID 96257175.

Luther, Claudia (May 19, 2004). "Arnold O. Beckman, 104". Chicago Tribune News. Retrieved 8 March 2014.

Loiselle, F.B.; Casey, J.R. (2010). "Measurement of Intracellular pH". Membrane Transporters in Drug Discovery and Development. Methods in Molecular Biology. Vol. 637. pp. 311–31. doi:10.1007/978-1-60761-700-6_17. ISBN 978-1-60761-699-3. PMID 20419443.
Ltd, W G Pye and Co (1962). "Potentiometric pH Meter". Journal of Scientific Instruments. 39 (6): 323. doi:10.1088/0950-7671/39/6/442.
AK Yetisen; H Butt; F da Cruz Vasconcellos; Y Montelongo; CAB Davidson; J Blyth; JB Carmody; S Vignolini; U Steiner; JJ Baumberg; TD Wilkinson; CR Lowe (2013). "Light-Directed Writing of Chemically Tunable Narrow-Band Holographic Sensors". Advanced Optical Materials. 2 (3): 250. doi:10.1002/adom.201300375. S2CID 96257175.

Vanýsek, Petr (2004). "The Glass pH Electrode" (PDF). Interface. No. Summer. The Electrochemical Society. pp. 19–20. Retrieved 3 April 2017.

"Theory and Practice of pH Measurement" (PDF). Emerson Process Management. December 2010. Archived from the original (PDF) on 2016-10-20. Retrieved 2017-04-03.

"pH Measurement and Value". Global Water. Xylem, Inc. Retrieved 21 March 2017.

Olson, Vickie (2015-04-15). "How to Select a pH Sensor for Harsh Process Environments". automation.isa.org. International Society for Automation. Retrieved 31 March 2017.

Buie, John. "Evolution of the pH Meter". Lab Manager. Retrieved October 7, 2010.

"What is a pH Meter and How Does it Work?". Mettler-Toledo LLC. Retrieved 21 July 2021.
"A guide to pH Measurement Theory and Practice". Mettler-Toledo LLC. Retrieved 21 July 2021.

Loiselle, F.B.; Casey, J.R. (2010). "Measurement of Intracellular pH". Membrane Transporters in Drug Discovery and Development. Methods in Molecular Biology. Vol. 637. pp. 311–31. doi:10.1007/978-1-60761-700-6_17. ISBN 978-1-60761-699-3. PMID 20419443.

"pH Measurement Handbook" (PDF). PragoLab. Thermo Scientific, Inc. Retrieved 22 March 2017.

Jaehnig, Kenton G. Finding Aid to the Beckman Historical Collection 1911 - 2011 (Bulk 1935 - 2004 ). Retrieved 30 October 2015. Click on 'Beckman Historical Collection Finding Aid' to go to full document. {{cite book}}: |website= ignored (help)

"Here's the new Beckman Pocket pH Meter". Science History Institute. 1956. Retrieved 6 August 2019.

Anthoni, J. Floor. "pH Meter Principles". seafriends.org. Seafriends Marine Conservation and Education Centre. Retrieved 28 March 2017.

AK Yetisen; H Butt; F da Cruz Vasconcellos; Y Montelongo; CAB Davidson; J Blyth; JB Carmody; S Vignolini; U Steiner; JJ Baumberg; TD Wilkinson; CR Lowe (2013). "Light-Directed Writing of Chemically Tunable Narrow-Band Holographic Sensors". Advanced Optical Materials. 2 (3): 250. doi:10.1002/adom.201300375. S2CID 96257175.

"Beckman Coulter Product Milestones" (PDF). Beckman Coulter. Archived from the original (PDF) on 2017-04-06. Retrieved 5 April 2017.
"Theory and Practice of pH Measurement" (PDF). Emerson Process Management. December 2010. Archived from the original (PDF) on 2016-10-20. Retrieved 2017-04-03.
MRC lab: How to Store, Clean, and Recondition pH Electrodes Archived 2015-09-22 at the Wayback Machine.