This is a sources sought notice for market research to identify potential suppliers capable of providing a ThermoFisher Scientific Attune NxT flow cytometer with a CytKick Max autosampler that meets NIST’s technical specifications. The required system must include blue, red, violet, and yellow lasers, 96-well plate sampling capability, a Windows-based control PC, startup consumables and QC beads, plus operations and maintenance documentation. Interested parties must submit a capability statement covering company details, business size, relevant experience, applicable contract vehicles, and manufacturing country. This notice is not a solicitation, and NIST will not pay for any information submitted in response. Responses are voluntary, and no solicitation documents currently exist.