I'm going to buy a torque wrench for some high-torque bolts in my car. I need a torque wrench to torque bolts from 130 nm (95.8 lb-ft) to 160 nm (118 lb-ft). I found some torque wrenches which support a range of 30 - 210 nm. However, I found a problem with all of them and that is the length of wrench. All torque wrenches of this range (even the most expensive ones) are about half a meter long (20 inches). Now, imagine you want to torque a particular bolt in your car to 160 nm (118 lb-ft). Torque = Force x Distance > 160 nm (16.31 kg/m) = Force x 0.50 (meter) > Force = 16.31 / 0.5 = 32.6 kg (about 72 pounds)
Do you think an average human arm can exert such a force (72 pounds) to a torque wrench handle? Why don't they make torque wrenches a bit longer? I don't think adding an extension to the wrench would be a good idea because you may damage it.