Help, I need to buy a torque wrench

Leadfoot said

You just have to wonder. If the specs call for 65 foot pounds is 60 or 70 unacceptable? Everything else in the engineering world has tolerances that they need to stay inside of. Usually +/- 5% give or take. Should torque wrenches be any different?

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Correct. Every good engineer will allow for what's known as a "safety factor". They know that no theoretical torque value, or torque wrench, will ever be 100% accurate. For example, I work on some military jet parts, and right now I'm looking at an assembly drawing that says "62-72 in/lb" for a small nut & bolt fastener. That's 67 plus or minus about 7.5%.