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P H Meter
Definition: An instrument for measuring pH, consisting of two electrodes to dip into the solution, one sensitive to the aqueous hydrogen ion concentration (frequently a glass electrode) and a reference electrode (often a calomel electrode), together with a meter to measure the e.m.f.
Source: The Penguin Dictionary of Science. London: Penguin, 2009. Credo Reference. Web. 08 August 2012.