What’s the difference between calibrating a torque wrench and checking it?
Calibration is conducted under very controlled conditions using a variety of specialized equipment and highly trained and experienced personnel. Traceability to NIST must be maintained for any and all measurement equipment, including the equipment used to calibrate the measurement equipment. Calibration is carried out in a tightly controlled environment with the actual temperature and humidity recorded to assure compliance with requirements. There is a level of technological rigor involved that is effectively impossible to replicate in vehicle service facilities.
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