These are clicker type wrenches that have a click that can be heard and felt.
Adjusting these tools is quick and easy because of a sliding scale with a locking mechanism (so that the torque doesn't get changed by accident). Also, you don't have to waste your time cranking the handle up to your desired value then back to zero after use.
The torque wrenches in this catagory have ratcheting heads can be removed. If you have the need to torque in the left hand direction, you simply remove the head and re-insert it upside down. Now you have a left handed tool.
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