The National Institute of Standards and Technology (NIST) is seeking sources capable of providing an array spectroradiometer, with the intent to potentially issue a Sole Source Award to Gigahertz-Optik, Inc. The required spectroradiometer must meet specific minimum specifications, including a spectral range from 280 nm to 1100 nm, dual detectors, and a compact, weather-proof housing, to support critical calibration tasks in a military laboratory environment. Interested parties are encouraged to respond with their capabilities and qualifications by contacting the primary point of contact, Elizabeth Timberlake, at elizabeth.timberlake@nist.gov, before the deadline for questions on February 11, 2025. This notice serves as a sources sought notice and does not constitute a request for proposals or quotations.