Here's a quick and easy way to calibrate a "click" torque wrench if you also have access to a simple beam torque wrench. I bought a double female socket drive adaptor which allows me to connect the two wrenches together. Now I can simply pull torque between the two wrenches and read the scale on the beam where the click happens.

Happy torquing,
Nick

Present lineup: '82 Cal Westy, '88 and '89 Jettas
Prev. owned: '59 beetle, '57 Porsche 356A, '62 VW camper, '66 Deluxe Microbus, '70 Westy, '81 diesel Rabbit