Simulation of high altitude testing for air transport is a mandatory requirement for many components. While there is pressure equalization in the cargo holds of aircraft, it cannot completely compensate for the pressure fluctuations. The pressure can fall below 800 mbar. In an electronic test plant, the components can be exposed to a pressure simulation test. Also significantly lower pressure levels can be simulated to test behaviour during a depressurization. In aviation and space exploration some components such as electric motors are operated outside of the pressurized cabins. Product testing for function must be completed. With suitable vacuum feedthroughs, motors and other devices can be operated and tested inside a vacuum chamber Components used in space must be able to withstand even much higher loads. For these applications, pressures of 10-6 mbar and lower must be simulated. To achieve pressures as low as this, a turbo molecular pump with a suitable backing pump is required.