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You can buy a quality 3/8 wrench for around $100. CDI and Precision are top names. And the HF Icon was recently tested by Grassroots Motorsports to be as accurate or more accurate than most of the big names.
As others have said, you can test the calibration using DIY instructions you can search for. There are also little digital torque boxes you can attach to measure the torque; they claim to be accurate within a few percent.
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