I used to get all the tools that needed it calibrated where I used to work. Surprising to me the torque wrenches from Snap On, Mac, Craftsman and some Chineseium (if we had one we used on the aircraft, our boss would let us calibrate them), all were in tolerance.
I think you would be good with one from Princess.
I'm like Gary, I use them on things like head bolts and such, and like to use them on wheel nuts.