It's a spectrograph but not used for chemical analysis in the lab, the receptor is loose and can be used for analyzing the spectral output of a source. It's not a photometer, that's either the receiver alone or tends to work at only one frequency. I've seen them labeled as spectrographs, but that's pulling up a whole load of bench top sample analyzers for chemists. Loose receiver that will give me a spectrum. Thanks for any help!