I use a 1/4" drive clicker type torque wrench that I got on sale at Nashbar. It's max is 25 nm, but it works great for all the small carbon bits on the fancy bikes that I build. I have a 3/8 drive sears for the BB. That 1/4" gets used all day, good tool, and good price...$49. My suppliers have offered me the same tool for $89 wholesale! It comes with a full set of allen bits, too!