Which of the following tools is used for continuity checks in circuitry?

The digital multimeter is an essential tool for performing continuity checks in circuitry. It measures various electrical properties, including voltage, current, and resistance. When checking for continuity, the multimeter is set to the resistance (ohm) setting. A continuous path in the circuit will allow current to flow, resulting in a low resistance reading, often accompanied by an audible beep in many multimeters. This is crucial for troubleshooting circuits to ensure that connections are intact and that there are no breaks or faults that could disrupt the flow of electricity.

In contrast, the oscilloscope primarily measures voltage waveforms over time and is more suited for analyzing signal characteristics rather than confirming continuity. A soldering iron is a tool used for joining components in a circuit rather than testing them. The signal generator creates electrical signals for testing purposes but does not assess the continuity of a circuit. Thus, the digital multimeter stands out as the correct choice for continuity checks.