Spectrophotometer
A device which measures the amount of ultraviolet light absorbed by a substance.
For example, vitamin A absorbs ultraviolet light so that a spectrophotometer can measure within minutes with almost perfect accuracy the amount of vitamin A in a given food.
The spectrophotometer, a key instrument today in biomedical laboratories, was invented in 1939 by the American chemist Arnold O.
Beckman (1900-2004)