Beckman electronic pH meter
pH-metro electrónico de Beckman
- Date
- 1934 · confidence high
- Place
- Pasadena, California, United States
- Credited to
- Arnold Beckman
- Field
- Knowledge & symbols
What it is
An apparatus that measures pH with a glass electrode and an electronic amplifier, giving the reading directly on a dial. Arnold Beckman developed it in 1934 to measure the acidity of lemon juice, and it gave the basis for a laboratory instrument industry.
The glass electrode derives from Max Cremer (1906) and Fritz Haber and Zygmunt Klemensiewicz (1909); Beckman's merit was a robust, portable instrument for common use.
What it led to
- fast, convenient pH measurement in industry and the laboratory
- the Beckman Instruments company and the DU spectrophotometer
- ion-selective electrodes