Why is an eyepiece graticule useful?

An eyepiece graticule is useful because it provides a precise scale or grid within the field of view of a microscope or telescope, enabling accurate measurements of specimens or celestial objects. This tool allows users to quantify sizes, distances, and angles directly through the eyepiece, enhancing the precision of observations and data collection. It is particularly valuable in scientific research, education, and any field requiring detailed analysis or comparison of small features.