America 250 Candidate: pH Meter
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AUTOMATION HISTORY · AMERICA 250 · REPLACEMENT CANDIDATE
Electronic pH Meter
American milestone: 1934 · Arnold O. Beckman · California
Status: Replacement candidate. Final number pending chronology audit.
Why it belongs in America 250
American chemist Arnold Beckman created a compact electronic instrument for measuring acidity accurately and conveniently. His pH meter combined electrodes, amplification and a readable electrical measurement into a practical laboratory and industrial instrument.
Connection to automation
Reliable electronic pH measurement became central to automated chemical, food, water-treatment and pharmaceutical process control.