like all calibrated tools, there is a specific duty range they are most accurate in. according to garagejournal.com's forums, the HF wrenches have a 10% error at their farthest operating values. I might use a 1/2" HF torque wrench, but I would rather use a more accurate wrench for finer work.
http://www.garagejournal.com/forum/s...d.php?t=184550