What tool is specifically designed to measure wire tension in aircraft rigging?

The tool specifically designed to measure wire tension in aircraft rigging is a tension meter or force gauge. This device provides accurate readings of the tensioning force applied to wires, cables, or other rigging components, ensuring they are adjusted to the correct specifications as stipulated in the aircraft's maintenance manual.

Using a tension meter helps in assessing whether the rigging components are within the proper tolerances, which is crucial for the safe operation of the aircraft. This is particularly important in rigging applications because improper tension can lead to inadequate control surface movement or even structural failures.

Other tools mentioned in the options serve different purposes. A multimeter is primarily used for measuring electrical properties such as voltage, current, and resistance, while a torque wrench is designed for tightening fasteners to a specific torque, not measuring tension in wires. An electronic scale is used for weighing objects and does not provide the specific measurements needed for wire tension.