The MM2 represents a new generation of quadrupol mass spectrometers with a membrane inlet. Equipped with flexible accessories such as the air-surface probe and the gas chromatograph with thermo desorption all tasks for chemical detection can be easily fulfilled. Introducing a novel vacuum system reflects the trend to high-performance but lightweight detection equipment and the application of current micro-controller based technologies for instrument control. With a volume of 43 litres and a weight of 35 kg a milestone in GC/MS technology has been achieved.