DF: reference material, accompanied by a certificate, the spectral absorbance of which is certified by a procedure which establishes metrological traceability to a national or international standard of absorbance, and for which each certified quantit
DF: reference material, accompanied by a certificate, the spectral absorbance of which is certified by a procedure which establishes metrological traceability to a national or international standard of absorbance, and for which each certified quantit
DF: reference material, accompanied by a certificate, the spectral absorbance of which is certified by a procedure which establishes metrological traceability to a national or international standard of absorbance, and for which each certified quantit