Always wind down a torque wrench to the lowest scale setting if you plan to keep it for longer than a few weeks (never to zero).
It is not necessary to wind back a torque wrench when it is in use. Storing a fully loaded torque wrench may cause the spring to set, thereby weakening it. However, some parts of the wrench may move a little if you totally discharge the spring to the zero setting. A little is a lot in the world of torque. Reapplying spring compression will cause these parts' orientation to change, which will impact accuracy.
After years of employment, we occasionally develop routines that deviate from these recommended practices. So review these and operate more efficiently.
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