spectrophotometer
Concise Oxford English Dictionary © 2008 Oxford University Press:
spectrophotometer /ˌspɛktrə(ʊ)fəʊˈtɒmɪtə/
▶noun an apparatus for measuring the intensity of light in a part of the spectrum, especially as transmitted or emitted by particular substances.
– derivatives
spectrophotometric /-təˈmɛtrɪk/ adjective,
spectrophotometrically adverb,
spectrophotometry noun.
spectrophotometric /-təˈmɛtrɪk/ adjective,
spectrophotometrically adverb,
spectrophotometry noun.
'spectrophotometer' also found in these Oxford entries:

