The Precision Measurement Equipment Laboratory Career Field provides maintenance, modification, repair, calibration, and certification for test, measurement, and diagnostic equipment. It also implements methods and procedures for managing the US Air Force Metrology and Calibration (AFMETCAL) Program as established and directed by AFI 21-113, Air Force Metrology & Calibration (AFMETCAL) Program. The AFMETCAL Program is a composite of measurement standards and equipment, users, calibration data, and integrated planning to provide a disciplined US Air Force program to ensure reliability, accuracy, and traceability of systems, subsystems, and equipment.