SK HandTools Model 74251 1/2-inch Drive Micrometer Adjustable Clicker Torque Wrench 250-foot-pound with case 1/2" Drive Micrometer Adjustable Clicker Torque Wrench 250Ft/Lb w/case Accuracy 20-100% of scale to the right (4% of reading) and to the left (6% of reading). 0-20% of scale 2 increments. Reversible ratchet head allows use for left and right threaded fasteners. Positive spring-loaded locking mechanism automatically locks in the selected reading Dual analog scale