A pH meter is an electronic voltmeter that uses a pH-responsive electrode to give a direct conversion of voltage differences to differences of pH at the temperature of the measurement. The Model G was introduced in 1934 by Arnold Beckman and was one of the first "table top," or portable, laboratory instruments available.
Listen to the latest episodes of CHF’s award-winning podcast.
Help us preserve and share the history of chemistry and related sciences. Make a tax-deductible tax-deductible gift online.
Kool-Aid package, 1951
©2010–2016 Chemical Heritage Foundation