The comprehensive offering of spectroscopy products from Sigma-Aldrich includes reagents, standards and supplies for mass spectrometry, NMR, ESR, fluorescence/luminescence, UV/VIS, IR and AAS / ICP techniques. Featured product lines include AQUANAL^® test kits for water analysis, TraceCERT™ traceable certified standards, TraceSELECT™ digestion reagents and our unique MALDI matrixes.