Which of the following tools is primarily used to measure electrical voltage and current?

The multimeter is the primary tool used to measure electrical voltage, current, and resistance. It is an essential instrument in electrical diagnostics and troubleshooting because it can provide accurate readings of various electrical parameters in a circuit. The multimeter operates by connecting probes to the circuit, allowing it to measure voltage (volts), current (amperes), and, sometimes, resistance (ohms) depending on how it's set up.

In contrast, a torque wrench is used for measuring and applying a specific torque to fasteners, such as bolts and nuts, which is unrelated to electrical measurements. Crimpers are tools designed to apply mechanical pressure to connect terminals to wires, particularly in creating electrical connections, but they do not measure electrical properties. Pliers are gripping tools used for a variety of tasks, including bending or cutting wires, but again, they do not measure voltage or current. Thus, the multimeter stands out as the most versatile and essential tool for electrical measurement tasks.