What instrument is normally used for precision leveling?

The instrument typically used for precision leveling is known as the coincidence level. This specialized tool is designed to provide highly accurate measurements when leveling surfaces, ensuring that they are perfectly horizontal or vertical. It utilizes a bubble vial or electronic sensor to detect slight deviations from true level, allowing millwrights to make fine adjustments as needed.

Coincidence levels are particularly important in machinery installation and alignment work, where even minute inaccuracies can lead to operational issues. The precision of this instrument is crucial for maintaining proper alignment of components, which is essential for the efficient functioning of machinery.

While other instruments such as the auto-collimator, the plum bob, and the optical micrometer each serve specific purposes in measurement and alignment, they do not provide the same degree of precision for leveling tasks as the coincidence level. The auto-collimator, for instance, is used primarily for angular measurement, while the plum bob is commonly used for vertical reference, and the optical micrometer focuses on measuring small distances rather than ensuring level surfaces.