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Portable devices: (a) FTIR—Thermo Fisher Scientific; (b) Raman—BioTools RamTest; (c) Gemini-combined Raman and FT-IR handheld analyzer—Thermo Fisher Scientific; (d) HI-BaySpec’s GoldenEye. Reprinted from Applied Spectroscopy, 72, Crocombe, R.A. Portable Spectroscopy, 1701–1751. [69], Copyright (2018), with permission from SAGE Publications
