The National Oceanic and Atmospheric Administration (NOAA) intends to negotiate a sole source contract with Sunburst Sensors, LLC for the refurbishment of specialized SAMI Version 2 pH sensors. This procurement is necessary because Sunburst Sensors is the original manufacturer of these instruments and possesses unique knowledge regarding their construction and operation, including proprietary software and user interfaces. The period of performance for this contract is expected to extend until September 30, 2025. Interested firms that believe they can meet the government's requirements are invited to submit documentation to Weiming Tan at Weiming.Tan@noaa.gov within 15 days of this notice, although no competitive proposals will be accepted.