This federal contract award was made by the National Institute on Alcohol Abuse and Alcoholism (NIAAA), which is part of the National Institutes of Health, to AB SCIEX LLC for the maintenance of a Sciex Qtrap 5500 mass spectrometer. The contract, valued at $31,088.35, is a firm-fixed price purchase order with a period of performance from July 2019 to June 2020. It was awarded on a sole-source basis under the simplified acquisition procedures outlined in Federal Acquisition Regulation Subpart 13, as NIAAA determined that only AB SCIEX LLC had the necessary knowledge, tools, and parts to perform the required repairs, calibration, and preventative maintenance on this specialized mass spectrometry equipment. No set-aside designation was used for this award. AB SCIEX LLC is a subsidiary of the Danaher Corporation, which is a major provider of scientific instruments and services to various federal agencies, including the Department of Health and Human Services, Department of Agriculture, Department of Defense, and Environmental Protection Agency.