Which of the following should NOT be used when measuring torque?

The micrometer should not be used when measuring torque because it is designed specifically for measuring small distances or thicknesses with high accuracy, rather than the rotational force or torque applied to a bolt or fastener. Torque measurement requires tools that can specifically apply and measure force in a rotational manner, which is provided by other tools mentioned, such as torque wrenches and hydraulic wrenches.

Torque wrenches and beam torque wrenches are specifically designed for this purpose, allowing for precise application and measurement of torque, ensuring that fasteners are tightened to the required specifications. Using a micrometer for this task would be inappropriate as it does not provide the necessary measurement of torque and could lead to improper fastening of components, compromising the integrity and safety of the assembly.