Which device is commonly used for visual inspection of electrical installations?

A commonly used device for visual inspection of electrical installations is the infrared thermometer. This tool allows the inspector to identify potential problems by detecting variations in temperature across electrical components and connections. It can reveal issues such as overheating circuits, poor connections, or unbalanced loads by showing abnormal temperature readings that may not be visible to the naked eye.

The infrared thermometer is particularly useful in scenarios where equipment is live and cannot be touched safely, allowing for inspections to be carried out from a distance. This non-contact method enhances safety while providing immediate feedback on the condition of electrical installations.

In contrast, a multimeter, oscilloscope, and voltmeter are primarily used for measuring electrical quantities such as voltage, current, and resistance, or for analyzing waveform behaviors, rather than performing an overall visual inspection of installations.