Scientists across many disciplines use mass spectrometry to identify unknown compounds, elucidate structures, and quantify components in a sample, whether it is solid, liquid, or gas. A mass spectrometer measures the mass-to-charge ratio (m/z) of molecules (and/or its fragments) and atoms. There is a wide variety of mass spectrometers available, which come in different configurations, from standalone, benchtop models to integrated systems, such as GC/MS and LC/MS.