The 4800 MALDI TOF/TOF™ analyzer (Applied Biosystems/MDS SCIEX) is a tandem time-of-flight MS/MS system, providing not only peptide identification but peptide sequencing. MALDI stands for Matrix-Assisted Laser Desorption Ionization but the real jewel of the system is the dual time of flight mass analyzers. The high level of sensitivity allows for fewer laser shots, conserving precious samples but detecting peptides missed by other systems. The MALDI TOF/TOF has such high through-put, hundreds of samples can be analyzed within minutes.