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Changes
added External Article ""Water Knowledge" by Martin Brungard."
* [http://embracethefunk.com/ph-readings-of-commercial-beers/ pH Readings of Commercial Beers, Embrace the Funk Blog, Brandon Jones.]
* [http://bitesizebio.com/8750/how-to-care-for-your-ph-meter/ How to Care for Your pH Meter; BitesizeBio.]
* [https://sites.google.com/site/brunwater/water-knowledge "Water Knowledge" by Martin Brungard.]
==References==