The National Oceanic and Atmospheric Administration (NOAA) is seeking sources for Kipp & Zonen CGR4 and CMP22 sensors to replace discontinued Eppley instruments used in sea-going radiation measurements. These sensors are critical for maintaining accuracy in long-term ocean surface flux observations that support weather forecasting and marine operations. Delivery of the instruments is required by August 30, 2026. No budget amount is specified in this sources sought notice. The location for performance of services is not mentioned.