Which tool is commonly used for measuring the alignment of shafts?

The correct choice, a laser alignment tool, is specifically designed for accurately measuring the alignment of shafts in mechanical systems. This tool utilizes laser technology to provide precise measurements over distances, allowing for the easy identification of misalignments between rotating shafts in machinery. Proper alignment is critical for reducing wear on components, preventing vibration issues, and enhancing the overall efficiency and lifespan of the equipment.

While a torque wrench is used for measuring and applying a specific amount of torque to fasteners, it does not provide alignment measurements. A digital multimeter is an electrical measuring instrument that can measure voltage, current, and resistance but is not relevant for mechanical alignment tasks. Similarly, a caliper is primarily used for taking linear measurements of dimensions and does not serve the purpose of assessing shaft alignment. Hence, the laser alignment tool stands out as the most suitable option for this specific application.