Before electrical work can be safely undertaken, the equipment must be de-energized, locked and tagged out, and verification must be made that the circuit is actually dead. What testing device is most certain to reliably verify that a circuit is actually dead?

Correct Answer: Option A — an auto-ranging digital multimeter

Auto-ranging digital multimeters provide precise numerical voltage verification with high input impedance, making them the most reliable instrument for confirming a circuit is truly dead before commencing work.