Celestia STS provides turn key solutions for satellite testing and operations. Since 2016 is part of Celestia Technologies Group (Dutch holding of 16 high-tech SMEs) and acts as competence centre for EGSE and TT&C solutions. Celestia STS has more than 30 years of experience in the space industry. More than 300 EGSEs and TT&C modems were delivered to Space Agencies, Large System Integrators, and specialised flight-equipment manufacturers around the World. Celestia EGSE solutions have been used in more than 80% of all European Space Agency Missions. Celestia STS testing equipment is available in standard functionality or configured to meet specific customer needs. Typically equipment is used either in clean room AIT environments or in ground stations. C-STS has a strong customer base, having delivered many systems to a variety of leading companies and institutions within the space industry including the European Space Agency (ESA), Airbus Defence and Space (ADS), Thales Alenia Space (TAS), OHB System (OHB), Surrey Satellite Technology Ltd. (SSTL) and many others.