Two photographs are taped together. A Solu bridge or meter determines the dissolved solids in water by measuring its conductivity. The ACTA V was a UV-visible spectrophotometer, first released in 1970.
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“Woman with Beckman ACTA V Ultraviolet Spectrophotometer and Beckman Model RA5 Solu Meter,” 1970–1979. Beckman Historical Collection, Box 80. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/ns064615m.
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