Stanley Proto J6022B 1-Inch Drive Ratcheting Head Micrometer Torque Wrench, 140-700-Feet Pound Calibrated to +/- 3% 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