The National Institute of Standards and Technology (NIST) is issuing a Combined Sources Sought Notice and Notice of Intent to Sole Source for preventive maintenance and repair services for a Thermo Fisher Scientific/FEI Titan 80-300 kV Analytical Transmission Electron Microscope (TEM). The primary objective is to ensure the operational readiness of this critical equipment, which supports a wide range of advanced research projects at the NIST Center for Nanoscale Science and Technology. Given the proprietary nature of the required parts and services, NIST intends to award a Sole Source contract to the FEI Company unless alternative capable sources are identified. Interested parties should submit their responses, including company information and relevant capabilities, to the primary contact, Forest Crumpler, at forest.crumpler@nist.gov, by the specified deadline, noting that there is no obligation for contract award or payment for submitted information.