Graticule - GCSE Biology Definition

In biology, a graticule is a small glass or plastic disc that is placed inside the eyepiece of a microscope. The disc has a grid or scale etched onto it, which helps in measuring the size of tiny objects or structures being observed, such as cells or tissues. By comparing the size of the object to the grid, students can estimate its dimensions. Graticules are useful tools in biology, as they provide a way to quantify observations made under a microscope, which is important for recording and analysing data accurately.