Measurement Services provides customers with the means to obtain National Institute of Standards and Technology (NIST) Standard Reference Materials®, Calibration Services, and Standard Reference Data. NIST supports accurate and compatible measurements by certifying and providing over 1300 of the highest quality and metrological value Standard Reference Materials to industry, academia, and government. These materials are used to perform instrument calibrations in units as part of overall quality assurance programs, to verify the accuracy of specific measurements, and to support the development of new measurement methods. The calibration services NIST provides help customers achieve the highest measurement quality and productivity. Standard reference data are well-documented numeric data that scientists and engineers use in technical problem-solving, research, and development. These recommended values are based on data extracted from world literature that are assessed for reliability and evaluated to select preferred values.