Which tool is specifically used to measure voltage?

The multimeter is the correct tool for measuring voltage because it is designed specifically for electrical diagnostics, allowing technicians to assess voltage levels in different circuits. This instrument can measure both AC and DC voltage, providing versatility for various applications in service work. Using a multimeter, a technician can accurately gauge the performance of electrical systems, identify potential issues, and ensure devices are functioning within their specified voltage ranges.

In contrast, the other tools listed serve different, specific purposes. A wrench is primarily used for tightening and loosening bolts and nuts, a socket set is used for fastening and unfastening nut and bolt heads, and a tape measure is designed for measuring physical distances or lengths. None of these tools have the capacity to measure voltage, making the multimeter the appropriate choice for this task. This distinction reinforces the importance of using the right tool for specific technical tasks in the field.