I was reading the Car Clinic section in my snail mail February 2010 Popular Mechanics magazine.
Powerbuilt Digital Torque Adapter, cost about $50.00 (for calibrating torque wrenches) and, OK Spark Plug Sensor. Magazine article doesn't give the websites of those two tools, easy enough to look them up on the web.
I don't use a torque wrench often, I want to buy a OK Spark Plug Sensor though. cuhulin