This quarter-inch TEKTON Torque Wrench is ready to use out of the box. The Drive Click sounds when it reaches a preset value, pre-calibrated to +/- 4% to ensure accuracy. The torque wrench has a reversible ratchet head that will operate both right and left. The unit features all-steel construction for durable wear, weighs 1.75 pounds and is 0.75 inches in height.