<div dir="ltr">I've had a Craftsman DigiTork torque wrench for over thirty five years, and still use it. It's stored with the spring completely relaxed, but after that long on a relatively inexpensive tool at the time, relying on its accuracy is really more a matter of trust than validation. That said, tests others have done on a number of torque wrenches, even (gasp) Harbor Freight, have shown them all to be generally OK. And a TR is pretty forgiving.<div><br></div><div>The procedure for *checking* calibration is pretty simple -- there's some very sophisticated lab equipment that uses the same mass-on-the-end-of-an-arm-approach. But let's say one wants to CHANGE something in the calibration. Has anyone ever done that on a DigiTork? There must be thousands and thousands of these still in use, yet I've never found any instructions or guidance for calibrating one.</div><div><br></div><div>(I have noticed that as the wrench has aged, the little torque values printed inside the window seem to have gotten smaller...)</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Aug 16, 2018 at 11:49 PM, <span dir="ltr"><<a href="mailto:glemon@neb.rr.com" target="_blank">glemon@neb.rr.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">That is a great tutorial on how to calibrate a torque wrench,I have to confess that I have two or three and I have never bothered in many, many years of ownership. For those that have done it or had it done how far off are they usually?<br>
<br>
Greg Lemon<br>
TR250<br>
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<br>
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