Stanley J6012C Proto 3/8-inch Drive Ratcheting Head Micrometer Torque Wrench 20-100 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.