NIRSpec Engineering Test Unit (image) NASA/Goddard Space Flight Center Caption The NIRSpec Engineering Test Unit was provided by the European Space Agency, with EADS-Astrium GmbH as Prime Contractor. NIRSpec will be the principal spectrographic instrument on board the Webb telescope. Credit EADS Astrium Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.