An unidentified man kneels in a field of crops looking at the reading on a Pocket pH Meter, first marketed by Beckman Instruments in 1956. A photograph from the same session appears in advertisements for the Pocket pH Meter.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry.
|Rights||In Copyright - Rights-holder(s) Unlocatable or Unidentifiable|
Preston E. Mitchell Commercial Photography. “Man in a Field of Crops Using a Beckman Pocket PH Meter,” circa 1956. Beckman Historical Collection, Box 86. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/765371328.
This citation is automatically generated and may contain errors.
Download selected image
Previous image shift + or , Next image shift + or . Pan image Zoom in + or shift + Zoom out - or shift + Zoom to fit 0 Close viewer esc Also
Mouse click to zoom in; shift-click to zoom out. Drag to pan. Pinch to zoom on touch.