Mass spectrometer and Spectroscope

Mass spectrometer noun - Spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer.

Spectroscope and mass spectrometer are semantically related. In some cases you can use "Spectroscope" instead a noun phrase "Mass spectrometer".

Spectroscope noun - An optical instrument for spectrographic analysis.

Mass spectrometer and spectroscope are semantically related. Sometimes you can replace phrase "Mass spectrometer" with "Spectroscope", this terms are similar.