Aijiren Series HPLC with OpenLAB 2.X Essential and Advanced Operation - 4 Days HPLC-INFII-2101c Hands-On 2200 2376 26-29 23-26 Gas Chromatography / Mass Spectrometry Aijiren B/5977 GC/MS Operation with MassHunter Data Analysis - 4 Days (R3900A) GCMS-5977-2100c Hands-On 2400 2592 6-9 10-13 27-30