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Re: torque wrench
I have one that is 20-130 and I rarely need anything outside that. That statement they make is a bit complex, but typically they are rated like this (and I think what they're trying to say);
At or above 20% of its capacity (in your wrench's case 30 ft lbs) it is accurate to +/-4 ft-lbs. Below the 30 ft-lb setting they can't claim that, but its rare that you need the 20-30 range anyway. It also only makes that claim for clockwise (right hand thread) torquing.
So, for instance, if you set it to 100 ft-lbs, its claiming accuracy between 96 and 104. I think my Craftsman torque wrench is +/-3.
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