Do I need a specific socket size to use this wrench?

The 3/8 drive head accepts any standard 3/8 drive socket. Grab the size you need for your bolt and you're ready to go.

How do I know when I've reached the correct torque?

The click mechanism will audibly and tactilely signal when the target torque is reached. Stop turning once you feel and hear the click — don't force it past that point.

Does this wrench need calibration or maintenance?

Periodically store it at the lower end of its range to reduce spring fatigue. For professional or high-volume use, occasional recalibration is recommended — check the manual for intervals.