A few more tips.

If a torque wrench has to be set down while using it, always set it down on its back with the driver facing up.

To the extent that it is possible, store the torque wrench in the environment where it will be used. For example, don't store the wrench in a 68° air conditioned house and then bring it into a 100° garage to be used. Wild swings in temperature and/or humidity can cause inaccuracies. A good calibrations lab will let a device sit in their facility for 24 hours before service so that the temperature and humidity can stabilize.


-Tim-