In this Masterclass, Prof. Dr. Dhiren Kataria from the Mullard Space Science Laboratory (MSSL) at University College London (UCL) speaks about the use of different mass spectrometry technologies in very low Earth orbit (VLEO) and the scientific reasons challenges behind that. With a special focus on the technology used for the DISCOVERER project, he elaborates on electrostatic analyzers, magnetic analyzers, combinations, and analyzers that can identify different particle species!