PH Meter
- An electric device used to measure acidity or alkalinity in solution.
HISTORY
In 1934, Arnold Beckman created the first pH meter. Before that, in 1906, Fritz Haber and Zygmunt Klemensiewicz made glass pH electrodes, but using them was tricky. Beckman's pH meter, a forerunner to Model G, made it easier to measure pH on a larger scale.