Now, anyone working in torque knows that this isn’t an easily agreed upon topic.   Certainly, if the wrench is wound back at all it should not be adjusted below the minimum scale marking (usually 20% of maximum) - never to zero as this can adversely affect the calibration of the wrench. Beyond that, it really depends on the application. We have thousands of Production Type wrenches in service that are left at their setting for months on end without a problem. Whilst the occasional user should adjust back to the minimum scale setting after use, if you use the wrench in an environment such as a commercial garage, the choice is yours. Either way is acceptable.   However, to make sure we were absolutely 100% certain of this, we carried out tests over the past month. We wanted to ensure that we could answer this long debated industry question with the upmost accuracy. The test was completed recently, designed to show the effects of leaving a torque wrench wound up at 100% of full scale against ...

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