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Metrologists perform metrology work involving precision measurement and comparison of physical quantities such as mass, length, time, force, speed, voltage and current. They calibrate precision equipment which measures these physical units. They may also certify that outside standards of such quantities as mass and volume are correct. Congress has authorized the National Institute of Standards and Technology (NIST) to set the standards of all physical quantities in the United States. The NIST was formerly called the National Bureau of Standards. Highly skilled metrologists are essential to the work of NIST.[1]