This is a sources sought notice from NIST for market research to identify vendors capable of supplying a Frequency Comb, not a solicitation for bids. The government will use responses to determine if a small business set-aside is possible, and all responsible sources, including large and small businesses, are encouraged to respond. The applicable NAICS code is 334516 with a 1,000-employee size standard, and respondents must indicate the country of manufacture. No budget information or performance location is specified in the notice. Capability statements are due by the date and time listed in the notice, with a four-page limit.