The Chair of Underground Construction at the Institute for Geotechnical Engineering (ETH Zurich) in-vite tenders for the purchase of a X-ray CT System. The system will be used for non-destructive in-situ multi-phase characterisation of heterogeneous rock and soil samples, concrete cores, and other po-rous materials. This tender document describes the required specifications of the system as well as the form of a tender to be submitted. For further information, please refer to the specifications.