10/13/2026
On This Date: October 13, 1936 Less than a century ago, measuring acidity quickly and accurately was a slow, frustrating job.In 1934, Sunkist needed a reliable way to test lemon juice acidity for quality control. Litmus paper wasn’t precise enough, and early electrical methods relied on fragile glass electrodes that shattered and gave signals too weak to use outside a physics lab.Dr. Arnold Beckman solved it by pairing two ideas: sturdier glass electrodes and vacuum tube amplification borrowed from radio engineering. On October 13, 1936, U.S. Patent No. 2,058,761 was issued for the result, the modern pH meter. A multi-hour ordeal became a two-minute test.Today, pH testing underpins quality work in food and beverage, water treatment, pharmaceuticals, and research labs.At Cambridge Environmental Products, we’re proud to supply Canadian labs with meters, probes, and traceable calibration buffers to keep that testing accurate and compliant.
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