Proto Ratchet Head Torque Wrench 1/2" Drive (50-250 Ft/lbs)

 Calibrated to +/- 3% clockwise direction & +/- 6% counter clockwise at 20% to 100% of full scale. Calibration is accomplished by manual loading the torque wrenches. Manufactured to meet standard industrial torque applications, general industry, heavy equipment, & maintenance.