出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/25 12:42 UTC 版)
A pH meter is an electronic instrument used for measuring the pH (acidity or alkalinity) of a liquid (though special probes are sometimes used to measure the pH of semi-solid substances). A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.