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* [http://www.omega.com/techref/ph.html Introduction to pH] – Excellent overview of pH and pH measurement at the Omega Engineering website
* [https://archive.is/20130112102326/http://portal.acs.org/portal/PublicWebSite/education/whatischemistry/landmarks/beckman/index.htm Development of the Beckman pH Meter] – National Historic Chemical Landmark of the American Chemical Society
* [http://www.boojakascha.ch/index.php?page=laborratte_en DigitalAnalogPrinter] – Freeware compatible with the device shown in the article to monitor the pH in real time
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