The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support Mechanical, is soliciting proposals for the procurement of Nitrate Ion Selective Electrode (ISE) Modules. This procurement aims to acquire commercial products that are critical for various applications in detection and navigation systems, aligning with the NAICS code 334511. The selected contractor will be responsible for ensuring compliance with stringent quality assurance and testing requirements, including production lot testing and timely delivery of samples. Interested vendors should note that the solicitation closing date has been extended to October 31, 2025, and are encouraged to contact Trevor L. Allander at 564-230-2182 or via email at TREVOR.L.ALLANDER.CIV@US.NAVY.MIL for further details regarding the submission process and technical documentation access.