Someone here a few years ago sent a precision split beam 250ft/lb wrench out for calibration, after several years of daily use torquing out nuts , it was still in spec.
When I get home tonight I'll search for the thread
I found the thread by member Traction.
After 14,000 lug nuts I got Torque wrench calibrated
I have a 1/2 inch 250ftlb Precision Instruments spilt-beam torque wrench I paid about $200 15 years ago. Had it calibrated 8 years ago, and have torqued over 14000 lug nuts since. Even though it always felt right I tried not to worry about it, but figured since I have saved over $600 on yearly...
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