NIST is conducting market research to identify sources capable of providing two balance thermocouple sensors with associated software: one for DC to 18 GHz with an N-type male connector and one for DC to 50 GHz with a 2.4 mm male connector, both with specified power ranges, thermocouple sensitivities, calibration uncertainties, and SWR limits. The software must interface with both sensors, operate on Windows 11, and be transportable to different computers. Interested parties must respond with company information, SAM registration/UEI, product details, customization capabilities, manufacturing country, business size, pricing, terms, and relevant experience. NIST notes this is market research only and does not obligate the government to award a contract. Responses should be submitted via email to the primary point of contact.