Got a question I've seen conflicting answers on in my research so wanted to ask here.

I've purchased a couple of Park Tool torque wrenches. The TW-6.2 and the ATD-1.2 adjustable torque driver.

The instructions for the ATD-1.2 don't say how it should be stored - does it matter? Should I store at the lowest setting (4 Nm). It goes up to 6 Nm in .5 increments. Doesn't have a zero setting.

The TW-6.2 instructions say:
Dial torque setting to lowest point on scale after each use. Also, dial setting to lowest point when storing torque wrench.

Does the lowest setting mean zero (which it was set to right out of the box when I got it). Or the lowest non-zero value. I've seen both answers in my research and I wanted to know if it matters.

Also, do you have your torque wrenches recalibrated? If so, how often? If it's a Park Tools, do you send it to them? Is it worth the cost to have that done vs. just buying a new one?

Thanks in advance.