Air Force Test Center, Installation Contracting, Eglin AFB, FL, intends to solicit and award a sole source firm-fixed price contract for one ZEN 3600 Zetasizer Nano ZS to Malvern Instruments, Inc., Westborough, MA, 01581-1042, USA, Cage Code: 68830, in accordance with FAR 6.302-1.  The North American Industry Classification System (NAICS) for this acquisition is 334516, small business size standard:  500 employees.  Interested parties may identify their interest and capability to respond to the requirement.  This notice is not a request for competitive proposals / quotes.  However, the government will consider all responses received within 15 days of publication.  A determination by the government not to compete this proposed contract based upon responses to this notice is solely within the discretion of the government.  All responses received within fifteen days after date of publication of this synopsis will be considered by the government. Responses shall be submitted electronically to [email protected] concerning this acquisition.