torque wrenches know-how
Just my two cents worth. Torque wrenches are great. They give you the opportunity to repeat an action over again and expect similar results. But...
they are only good as designed if they have been tested for accuracy. For example, a 30-150 in lbs click torque wrench may have the range of torque you may wish. If it is calibrated, it will perform within its specs. My opinion of calibration runs as follows: If you need a tool to measure something, make sure that the range of that tool is in the center, or close to it, of that tool. So, if you need to ensure a torque of 40 in. lbs., then use a torque screwdriver that has a range of 10-60 in. lbs. A torque wrench(or torque screwdriver for that matter) is at its best in the median of its range. For calibration, contact your vendor. His contacts are probably the best and the most economical, and the quickest, of course.
Tazzman