Which tool is essential for measuring electrical current?

The multimeter is essential for measuring electrical current because it is specifically designed to measure voltage, current, and resistance in electrical circuits. It can be configured to measure both direct current (DC) and alternating current (AC), making it a versatile tool for various applications in electrical troubleshooting and analysis. The device displays the measurement on a screen, allowing technicians to assess the strength of the current flowing through a circuit.

In contrast, while an oscilloscope is useful for visualizing waveforms and understanding the behavior of electrical signals over time, it does not directly measure current in the same straightforward manner as a multimeter. An insulation tester is primarily used to check the integrity of electrical insulation, ensuring safety and preventing failures, rather than measuring current directly. A torque wrench is a mechanical tool used to apply a specific amount of torque to fasteners and has no relevance to electrical measurements. Therefore, the multimeter stands out as the critical instrument for accurately measuring electrical current.