Workingwithmetallurgicalandlaboratoryexperts,morethan70differenttypesosfrecalibrationsamplesandchecksamplesofindustriallyimportantmaterialshavesincebeenmanufactured.SUSnowhasproducedreferencematerials.Fourlowalloyandmediumalloysteelscontainingmorethan20elementswithanalysiscertificateareavailable.AlsochecksamplesforC/S/Ncombustionnaitsareavailableaswell. SUSatpresentsupplies,directlyorindirectly,toalltypesofusersofAEspectrometers,metalproducersandprocessors,research/testingLaboratories,aswellasspectrometermanufacturers.