spectrograph

spectro- +‎ -graph

• (US) IPA^(key): /ˈspɛktɹəˌɡɹæf/

spectrograph (plural spectrographs)

1. A machine for recording spectra, producing spectrograms.
   • 1960 June, “Talking of Trains: New B.R. research laboratory”, in Trains Illustrated, page 329:

     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; [...].

• quantometer

• spectrographic
• spectrography

• “spectrograph”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.