Have you looked at the Warren and Brown range?
I have both types, a 'clicker' with a vernier type adjustment and also deflecting beam types.
I have to have them checked for calibration on an annual basis, had them many years now and they have not drifted from day 1, though I always make a point of backing the clicker off right after use.
After using both for a long while now, in many ways, I do lean towards the deflecting beam type wrenches. Some may say that they are not as accurate to set as the clicker types, however it does need to be kept in mind that tightening fasteners by a Torque method is at best only within 15% accurate and can be out by as much as 30%.