- Dwg. No. CD-2000B
The diagram is annotated in red and blue ink, indicating first and second position.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an…
- Beckman Reprint R-38
Beckman Instruments reprinted and distributed this paper, originally published in Analytical Chemistry Vol. 22, No. 6, June 1950.