Answer: A cable pulling dynamometer is a crucial tool used to accurately measure and monitor the tension force on conductors and cables during overhead transmission line stringing and underground cable laying. It is essential because it ensures that the conductors are tensioned to the precise specifications required by engineering standards. This prevents over-tensioning, which can damage the cable or equipment, and under-tensioning, which can lead to excessive sag. Using a dynamometer is key to ensuring the safety, reliability, and longevity of the power line infrastructure.