Which tool is primarily used for measuring shaft misalignment?

The dial indicator is specifically designed for measuring shaft misalignment with high precision. Its function relies on a sensitive gauge that can detect minute movements and variations in shaft positioning, allowing operators to identify misalignments that could cause vibration, decreased efficiency, or mechanical failure in equipment.

The dial indicator's ability to provide accurate readings makes it ideal for determining the precise alignment of shafts in rotating machinery. By measuring the relative position of the shafts at various points, it facilitates the necessary adjustments to bring them into proper alignment. This process is crucial in maintaining the longevity and performance of machinery.

In contrast, a caliper is more suited for measuring dimensions or thickness, while a ruler provides basic length measurements. A level, on the other hand, is typically used to check horizontal or vertical alignment, but it does not offer the precision needed for detecting misalignments in rotating shafts. Therefore, the dial indicator is the appropriate tool for this specific task.