Should always re checheck the torque of the wheel after few hundred miles, or sooner if you like. I use a "click" type torque wrench and there have been times where I have found that few a hundred mile later the heels need retorquing.
As far as the pointer type not needing calibration, you are right, however those wrenches rely on sping tension, which over time will wear. You then have to buy a new wrench all together.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section