Instruments designed for photometric analysis. Photometers can be used to measure the presence and concentration of organic and inorganic compounds in solution by determining the absorbance of specific wavelengths of light.
Central Scientific Company. “Precision Photometers.” Catalog K: Physical Apparatus for Universities and Colleges. Chicago, Illinois, May 1912. https://digital.sciencehistory.org/works/j9602065z.
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