Densitometers measure a material's density. This particular model was first produced in 1967.
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Illig, Russell. “Beckman Model R-101 Microzone Cell and Model R-110 Microzone Densitometer,” n.d. Beckman Historical Collection, Box 59, Folder 135. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/6682x441f.
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