History of the pH Meter

by Sara

The first commercial pH testers were built around 1936 by Arnold Beckman in the United States and by Radiometer in Denmark. However, glass pH electrodes that have a potential dependent on activity of H+ ions were constructed already 1906. The main problems to construct a pH tester was to design a sensitive high-gain amplifier and pack it in a compact, portable unit.

Since then pH testers became one of the most popular and important instruments used by chemists and non-chemists in labs, field and industrial environment. The basic ideas behind the pH tester haven't changed. However, the reliability and precision of today's pH tester are of course much better. Also many of the modern pH instruments are digitized and able to communicate with computer.

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Dec 04, 2011
old technology :)
by: Dean

The pH glass electrode technology is almost unchanged in the past 60 years, yet pH electrode manufacturing remains an art. The glass tip is formulated and blown by highly skilled glass blowers. This is an important step in the electrode manufacturing.

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