Arnold O. Beckman, inventor of the pH meter, died recently at age 104.
Beckman, a resident of Corona Del Mar, Calif., was born the son of a blacksmith on April 10, 1900 in Cullom, Ill., and became the friend of world leaders. Of all his scientific innovations, Beckman was perhaps best known for inventing the pH meter, an instrument that changed an industry and served as the foundation for the company that still bears his name. (Link)