The Martin Sprocket & Gear Click-Type Micrometer Adjustable Torque Wrenches are designed to offer an accuracy of +/- 3 percent CW and +/- 5 percent CCW. The torque wrenches feature an aluminum knurled handle and an easy-to-read laser etched dual scale (ft-lb and Nm). Available sizes include 1/2" drive (30-250 ft-lbs), 3/4" drive (100-600 ft-lbs), and 1" drive (200-1000 ft-lbs).