I have HF torque wrenches and they work fine. Can they break? I suppose so, but I think I'll know it if they do. As our friend Pedro has said, most of this stuff is common sense: with a little experience and knowing the size of the nut and the length of the lever arm (wrench) you're working with should pretty much tell you how hard to crank on the thing. I get the distinct impression he hardly ever uses a torque wrench. IIRC, he's even said as much.
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