This accessory allows spectrophotometer operators to analyze samples at a distance. The inscription on the back of this image suggests that it was taken by Bill Henderson, although he could also be attributed as the author of the inscription.

The Beckman DK Spectrophotometer was an enhancement of the DU, which expanded the instrument’s range of into near-infrared. This was accomplished by chemist Wilbur I. Kaye, who began his work on science behind the DK at Eastman Kodak, and continued it after he was hired by Beckman Instruments. The model DK is named after him and his innovation.