Unlike conventional UV-Vis and NIR monitoring techniques, Raman spectroscopy provides molecular specificity in real-time measurements of gas, liquid, and solid samples, both natural and synthetic. These attributes are responsible for the emerging reliance on Raman spectroscopy for a number of online process and reaction monitoring applications. Numerous sampling options, including fiber optic probes with long reach and stand-off probes for measuring inside containers and vessels make the technique adaptable to a myriad of environments and conditions.