The National Institute of Standards and Technology (NIST) is seeking information from vendors capable of providing a Closed Cycle Cryogenic Cooling System to enhance an existing cryogenic microwave probe station. The system must eliminate the reliance on liquid cryogens and include essential components such as a helium compressor and a cryocooler with a cooling capacity of 1.5W@4.2K, along with installation support and training to ensure compliance with technical specifications. This procurement is critical for facilitating calibrated microwave measurements of materials and circuits at variable temperatures, with delivery expected by January 31, 2026, to NIST-Boulder, CO. Interested parties should submit their capability statements to Clifford Nicholson at clifford.nicholson@nist.gov by the specified deadline, as this announcement is part of market research to determine potential small business set-aside opportunities.