This is a market research Sources Sought notice, not a solicitation, from NIST seeking information on vendors capable of supplying ten Atomic Clocks for Ensemble Time Scales. The clocks are required for performance in Boulder and Gaithersburg. Responses must indicate the country of manufacture and include a capability statement limited to four pages. No budget amount or submission timeline is specified in this notice. The government will use the results to determine if a small business set-aside is possible.