My first career was in aviation and all of the torque wrenches we used had to be laboratory calibrated and certified on an annual basis.
Whether this applies or not ... I don't know. It is an apples to oranges comparison because of the different types.
In all the shops I worked in we used Snap-On/Blue Point ratcheting click torque wrenches and only once did a torque wrench fail to be within specs/calibration and require repairs.
Buy good stuff and have confidence. Torque wrenches that are factory calibrated and certified are calibrated and meet FAA requirements until a new certification is required. To put it into perspective you could send a torque wrench to Snap-On, have it factory calibrated and certified, and it would satisfy FAA requirements.
Last edited by fish head; 11/20/14.