Got Yah GaryD - wasn't sure about that so thought I'd help you out. You may already be aware of this, but you can purchase a digital add-on for about 35.00 that you can use on your existing wrench. It may be an inexpensive alternative.
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I guess that'll work on a clicker wrench, but not for a beam wrench. How would a beam wrench get out of calibration....if it's never been dropped or jarred - just old age and metal fatigue??
Calgary, I did check google, but there are so many places and prices. I was mainly looking for someone with first hand experience with a company and a brand/quality of a wrench.
Mine are 3/4"