This precision deflecting beam torque wrench features a 3/4" square drive and has an accuracy of +/-2% throughout a range of 100 - 540Nm (20 - 220ft.lbs).Deflecting beam torque wrenches work by applying torque to a deflecting beam rather than a coil spring. With no wearing parts, the unique design ensures accuracy of +/-2% throughout the range of the wrench.The torque setting can easily be set via a sliding scale which displays the torque units. The dual signal feature allows the user to see, feel and hear when the selected torque has been reached. Warren & Brown Tools deflecting beam torque wrenches are an icon in the Australian automotive industry. With unparalleled accuracy and durability enabling it to stand the test of time, they're still regarded as an invaluable tool for any serious mechanic.