The API 165 LC/MS System is the most rugged and reliable single quadrupole LC/MS system available. Mass Range 59-3000 amu. It delivers superior performance for your most demanding applications, characterization of pharmaceutical compounds in lead discovery and optimization, identification of pharmaceutical impurities and degradation products, quantitative and qualitative research studies for drug discovery, and analysis of proteins and peptides. The API 165 system with Analyst Software provides single-point system control of a variety of LC pumps and LC peripheral devices. The powerful software and dependable hardware together provide a total solution for qualitative and quantitative analysis.