Stanley J6022B Proto 1-inch Drive Ratcheting Head Micrometer Torque Wrench 140-700 ft.-lbs 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.