Calibrated to +/- 4% in clockwise direction and +/- 6% in counter clockwise direction.
Calibration is accomplished by mechanical loading of each wrench in a horizontal position, and performing a three click test at 20%, 60% and 100% of maximum instrument capacity.
Certification documents traceable to N.I.S.T. (National Institute of Standards and Technology). CERT Version Only.
Manufactured to meet precision/highly accurate applications such as military and aerospace.
