spectrograph
noun
- instrument or apparatus for photographing or otherwise recording spectra
Wiktionary
Pronunciation: /ˈspɛktɹəˌɡɹæf/
noun
Etymology: From spectro- + -graph.
- A machine for recording spectra, producing spectrograms.
“Diesel maintenance schedules are benefiting from work done on the magnificent Hilger & Watts electronic spectrograph for oil analysis, which detects minute quantities of metals in samples of used lubricating oil; […].”