I hawe two of them, the small one is 2-30 Nm, the large one is 1o-210 Nm.
I mostly use them working on the engines of my motorbikes.
On regulators I just use the small one for the retainer of the swivel turret of my SP MK5 - MK10.
For all other parts I do not find that using a torque wrench is "mission critical". It can be useful the first times you are doing the service. After a while your hand already knows how much force to apply...
Funny, I beleive the first torque wrench I ever bought was to properly tighten the rear axle on my motorcyle after having the tire replaced. I had read of horror stories where where shops did not properly tighten the axle only for the rider to find out on their own, narrowly escaping disaster. I did not want to be a part of that statistic, so I pulled and replaced my wheel(s) myself and ensured it was done correctly.
-Z