I worked with a well respected senior mechanic at Delta airlines. He bought a few torque wrenches at Harbor Freight for home use. (On the job requires ONLY Delta tooling with documented identification number and expiration date) He brought his personal tools into work to have Delta calibration test them. He was proud that every one of them tested out EXACTLY as advertised.One of the few times I've been in HF, a employee at the register told a man in front of me not to buy his torque wrench because they were junk. Couldn't believe he said that.