Being a noob and nervous as hell about slipping someone a mickey (aka food poisoning) I found the following articles helpful in settling my nerves before I make my first sauces. If these have been posted before I apologize...a person can only search so many threads before their eyes bleed from strain or their patience wears out. Hope these help
http://www.fapc.okstate.edu/files/factsheets/fapc117.pdf - ph and meters
http://extension.usu.edu/files/publications/publication/FN_Food_Safety_2008-01.pdf - ph and meters
http://foodscience.caes.uga.edu/extension/documents/FDAapproximatepHoffoodslacf-phs.pdf - food ph's
http://www.fapc.okstate.edu/files/factsheets/fapc117.pdf - ph and meters
http://extension.usu.edu/files/publications/publication/FN_Food_Safety_2008-01.pdf - ph and meters
http://foodscience.caes.uga.edu/extension/documents/FDAapproximatepHoffoodslacf-phs.pdf - food ph's