When Arnold Beckman, a professor of analytical chemistry at the California Institute of Technology, was asked to devise a way to measure acidity in citrus fruit, the resulting “acidometer” ...

Which pH meters are best? There are numerous reasons you may want a pH meter. Maybe you just bought a new hot tub, plan on starting a hydroponic garden or want to test your drinking water to ensure it ...

A pH meter measures a pH or the acidity/alkalinity of substances. Most pH meters rely on a glass electrode that measures the number of hydrogen ions in the solution. Usually, pH meters need to be ...

Which pH meters are best? There are numerous reasons you may want a pH meter. Maybe you just bought a new hot tub, plan on starting a hydroponic garden or want to test your drinking water to ensure it ...

In addition to pH, ion, voltage and temperature measurement, the combined 781 pH/Ion Meter also offers an automatic stirrer control, a multi-point calibration with up to nine buffers (pH mode), a ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. A pH meter measures the acidity of ...