Torque Wrench, 1/2Dr, 50-250 ft.-lb.

Calibrated to +/- 3% in clockwise direction and +/- 6% in counter clockwise direction, Calibration is accomplished by mechanical loading each wrench in a horizontal position, Certification documents traceable to N.I.S.T. (National Institute of Standards and Technology), Manufactured to meet precision/highly accurate applications such as military and aerospace