Which tool is commonly used to test the signal strength of a wireless network?

A spectrum analyzer is the tool commonly used to test the signal strength of a wireless network. It is designed to measure the strength of various frequencies and allows technicians to analyze and visualize the signal characteristics in real time. This capability is crucial for diagnosing issues, optimizing network performance, and ensuring the integrity of wireless communications.

In contrast, a multimeter is primarily used for measuring voltage, current, and resistance in electrical circuits, making it less suitable for signal strength analysis. A cable stripper is a tool used for preparing cables by removing insulation, and a torque wrench is used for applying a specific torque to fasteners. Neither of these tools has the capability to measure or analyze radio signals, which is essential for wireless network diagnostics.