If you aren't already familiar, it may be worth your while to browse through ParkTool's page about threads. Understanding the notion of thread preparation is critical when using a torque wrench.
The link takes you to a cached page. When ParkTool switched to their new site,
AFAIK, they didn't create a new version.
http://snipurl.com/klvy
BTW: I got a click-type 1/4" that measures in in-lbs for about $30 from Harbor Freight Tools online site. That and a (maybe $9) set of 1/4" hex bits from Sears (Craftsman) works just fine.