NASA intends to issue a sole source contract to TSI Incorporated for the purchase of Aerotrak Portable Particle Counters, as they are the sole provider. Performance of the services will be located at NASA’s Kennedy Space Center (KSC). The procurement is for commercial items under FAR Part 12, with NAICS Code 334516. Interested organizations may submit their capabilities and qualifications for evaluation to determine if competition is possible. No budget amount is specified in the description.