Which device is commonly used to measure time intervals with regular beats?

The correct choice is a metronome, which is a device specifically designed to produce regular, timed beats or clicks. Musicians commonly use metronomes to maintain a consistent tempo while practicing or performing. The primary function of a metronome is to provide a steady pulse that helps in timing musical pieces, allowing individuals to keep in rhythm and develop a sense of timing in their playing.

In contrast, while a chronometer is used for precise timekeeping, particularly in navigation and sailing, and a stopwatch is used to measure elapsed time for sports and activities without a consistent beat, they do not produce regular beats themselves. A pedometer counts steps taken and measures distance traveled rather than time intervals, making it unsuitable for measuring rhythmic beats.