NASA awarded a firm fixed-price purchase order contract worth $218,267.00 to Zygo Corporation, a manufacturer of optical metrology systems, for a 4-inch VeriFire Interferometer. This interferometer will be used to verify the performance of parts during acceptance testing for NASA missions. The contract was awarded on a sole-source basis as Zygo is the only vendor qualified to provide a replacement system that can interface with NASA's existing, specialized collimation optics. There was no set-aside designation for this award. Zygo Corporation is a subsidiary of Ametek Inc., a global manufacturer of electronic instruments and electromechanical devices that has provided subcontractor support to various prime contractors working on aerospace and defense projects for federal agencies.