This tool is used to test the voltage on power outlets and power supplies and well as testing copper wires for resistance and continuity.

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This question tests a tool’s ability to measure electrical characteristics like voltage, resistance, and continuity. A multimeter is designed to do exactly that: it can measure AC or DC voltage to verify outlets and power supplies, and it can measure resistance and perform a continuity check to determine if copper wires are intact and properly connected. The other options have narrower purposes: a cable tester checks whether individual conductors in a cable are connected but doesn’t typically measure voltage; a toner and probe helps locate and trace cables rather than measure electrical values; a TDR (time-domain reflectometry) is used to locate faults along long cable runs by sending pulses and observing reflections, not for general voltage or continuity checks.