Proto J6020AB 3/4" Drive Ratcheting Head Micrometer Torque Wrench 120-600 ft-lbs

Calibrated to +/- 4% clockwise direction and +/- 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, and maintenance.