The wrench measures in Newton Metres and has both touch sensation and audible indicators when preset torque value is reached. The 1/2\" drive unit has a 40 to 200 Nm torque handling capacity. Each wrench has its own certification number, like a car\'s VIN, and each tool is tested and certified for accuracy before it leaves the plant. Turning serious bolts? Here\'s a serious wrench ready for jobs where precision tightening is mandatory. 1/2\" Drive, 40-200 Nm, 0.5 Resolution, 18 11/16\" / 475mm length