How to know if you got a quality install?

[3kushn]

I use a spring scale to double-check my cheap torque wrench. Requires a little math, pretty easy. For most things with torque in the 10's of ft. lbs. and rounding off to the nearest 1 or 5 ft. lbs. these are not precise numbers. Would not be practicable.

Really not following this.
The only way to "check" a wrench is with a Torque transducer.

A fish scale (spring scale) or whatever is a force gauge vs torque gauge.

What's the math for the correction?