The National Institute of Standards and Technology (NIST) is seeking information from industry sources to determine the availability of thermally insulating rectangular waveguides for use in power measurement systems at its Boulder, Colorado site. This is a market research notice only, not a solicitation, and responses are due by July 17, 2026. NIST anticipates that delivery, installation, and training will occur within 16 weeks after receipt of an order. No specific budget amount is mentioned in the notice. The performance location is the NIST Boulder site.