A torque wrench is a tool that typically accepts some size of socket and allows the user to tighten a nut or bolt. The torque wrench is set to a torque setting and when in use, it will alert the user when they have applied enough torque to the fastener.
Digital Torque Wrench
A digital torque wrench, like the one in the Amazon Affiliate box at the right, is a torque wrench that has a digital reading of the torque so that you can see when you are getting close to the desired torque.