This procurement is a sole-source award to Photothermal Spectroscopy Corp. (PSC) for a counter-propagating mode upgrade. The justification is based on PSC being the only supplier capable of providing 100% compatibility with the existing Photothermal mIRageLS instrument at the FDA, due to proprietary patented O-PTIR technology. No submission timelines or budget amounts are specified in the description. The upgrade requires seamless integration with the FDA’s current software and hardware. PSC is a U.S.-based small business that owns the exclusive intellectual property rights for this requirement.