What device does the electrician bring to ensure safety at the scene?

The correct device that an electrician brings to ensure safety at the scene is a voltage tester. This essential tool measures the presence of voltage in electrical circuits and equipment, which is crucial for determining whether it is safe to work on a particular system. By using a voltage tester, an electrician can verify that power is off before proceeding with any work, significantly reducing the risk of electrical shock or injury.

While safety goggles, protective gloves, and fire extinguishers are all important safety items in an electrician's toolkit, the voltage tester specifically addresses the direct risk associated with electrical work. Safety goggles protect the eyes from debris or potential hazards, protective gloves provide insulation from electric shock and physical hazards, and fire extinguishers are vital for responding to any fires that may occur. However, it is the voltage tester that directly helps ensure that the electrician is working on de-energized equipment, making it a critical device for safety in electrical environments.