The National Institute of Standards and Technology (NIST) is conducting market research to identify potential sources for an optical dilatometer with heating microscope capability, which must meet specific technical specifications including a furnace capable of reaching at least 1700°C and a resolution of 1 µm or better. The equipment must be delivered with installation, training, and a minimum 1-year warranty, and be suitable for a typical laboratory benchtop. No budget amount is specified in the description. The location for performance of services is not mentioned. This is a sources sought notice, not a solicitation, and NIST has not yet determined its acquisition strategy.