How to use a torque wench

A torque wrench is a tool that allows you to tighten a bolt to its specified torque. Every bolt technically has a torque spec, but it's really most important in mechanical applications. It is important that the bolt doesn't come loose, and it's also important that you don't strip the bolt. 

This is an electronic torque wrench. The red button turns it on and off, the grey button changed the settings from foot pounds to inch pounds, and the bottom of the wrench is a dial to set your torque. When working on something where torque is important, look up online or in a manual what the torque spec is. Set the wrench to your torque, find the correct size socket for your application, and tighten the bolt until the wrench clicks back. Then your bolt is tightened to torque specifications. If you have a non electronic torque wrench, it will just have a bottom dial of some sort to set your torque, and it will still click when the bolt is tight enough. Hope this is helpful