Been looking at doing a few things on the car whereby I will need to torque some bolts. I have a £20 torque wrench which has the range I need for tightening the subframe bolts and engine mounts. Trouble is I see there are a lot of branded wrenches that command prices in the 100s of pounds. Why the big difference in prices? If a wrench is set to 76ft/lb then surely a £20 should manage the same as a £200 one? I know some will say about quality and calibration, but is it worth me spending out or should my £20 one suffice?