The Department of Defense, through the Naval Information Warfare Center (NIWC) Pacific, intends to award a sole-source, Firm-Fixed-Price purchase order to Reuter-Stokes, LLC for Helium proportional counters. The procurement specifically requires 40 units of 1-inch diameter HE-3 proportional counters with an active length of 7.3 inches and 20 units with an active length of 20 inches, both essential for various measurement and control applications. This award is justified under FAR 13.106-1(b) as Reuter-Stokes is deemed the only capable source for these specialized items. Interested vendors may submit bids by December 15, 2025, at 11 AM Pacific Time, via email to stephen.a.oneill8.civ@us.navy.mil, and must be registered in the System for Award Management (SAM) to be considered.