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  3. Laser-Induced Breakdown Spectroscopy (LIBS)

Does the surface need to be prepared before testing metal with the KT-100S handheld LIBS analyzer?

Yes. LIBS is very much a surface technique so any surface contamination would be included with the plasma and affect the results.  For that reason, the KT-100/100S analysis time includes 1 second of Drill Down by default to improve data quality. For heavy corrosion or other contamination, it is recommended to use a grinding medium to remove the surface layer until you can see the base metal.