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@deleted
T wrenches are calibrated, and tested to ensure they are accurate. Modern ones are, very, especially the expensive dig ones. You can do it yourself simply to well within 25% accuracy with a rod and a weight.
All the wrench is doing is telling you the force being applied to the object being tensioned. They do not, can not, and do not claim to, tell you about what's happening to the bolt or whatever, beyond the power being applied to it's head.