Which tool is commonly used to measure line tension?

The dynamometer is the appropriate tool for measuring line tension because it is specifically designed to gauge the force exerted by a tensioned line or cable. In applications such as lineman work, understanding the tension in lines is crucial for safety and operational efficiency. A dynamometer provides a direct reading of this tension, allowing linemen to assess and manage the loads on electrical and communication lines accurately.

In contrast, a caliper and a micrometer are primarily used for measuring physical dimensions such as length, width, or thickness, not force or tension. A voltage meter, on the other hand, is utilized for measuring electrical voltage, which does not relate to the measurement of physical tension in lines. Therefore, while all the other tools have their respective applications, only the dynamometer serves the specific purpose of measuring line tension.