Merck 108962 Refractive İndex Standard Kit 1 2,2,4-Trimethyl-Pentane/Water, Traceable To Srm From Nıst And Ptb N (20°C)=1,3915 Certipur®Merck 108962 Refractive İndex Standard Kit 1 2,2,4-Trimethyl-Pentane/Water, Traceable To Srm From Nıst And Ptb N (20°C)=1,3915 Certipur®, Merck108962.0001