The National Institute of Standards and Technology (NIST) is conducting market research to identify vendors capable of supplying a Cesium beam atomic clock, with responses due by the date and time specified in the notice. This is a sources sought notice, not a solicitation, and no contract will be awarded from this announcement. The government will use the results to determine if a small business set-aside is possible, and all responsible sources, including large and small businesses, are encouraged to respond. No budget amount is specified, and the location for performance of services is not mentioned. Interested parties must submit a capability statement limited to four pages, including manufacturing country and typical lead time, to the contract specialist via email.