There is a wide selection of pH meters available from Amazon.com. I just purchased the one sold for beer-making after reading reviews. I also purchased storage solution and calibrating solution, which I believe are needed. All of this arrived while I was on vacation, so I haven't used it yet.
I will be posting more about my experiences with the pH meter and other fascets of my eating on the Koufman low acid diet thread.
Post Edited (sunbeam48) : 10/10/2011 7:04:58 AM (GMT-6)