Which tool applies additional leverage to a fastener and measures the force applied?

The torque wrench is specifically designed to apply a precise amount of torque (rotational force) to a fastener, such as a bolt or nut. This tool helps ensure that the fastener is tightened to a specific specification, which is critical for maintaining safety and performance in various applications, such as in automotive or construction settings. By measuring the force applied, the torque wrench not only helps in achieving the correct tightness but also prevents over-tightening, which can lead to damage or failure of the fastener or the components it is securing.

In contrast, other tools like a monkey wrench and an adjustable wrench are primarily used for gripping and turning fasteners but do not measure the torque or the force being applied. They lack the precision feature required to determine whether the correct force has been applied to the fastener. Meanwhile, a pry bar generally serves the purpose of lifting or prying apart objects and does not have any function related to fastening or measuring torque. This distinction underscores the specialized nature of the torque wrench in applications requiring precise torque specifications.