Metrology Glossary: Eyepiece Graticule

What Is An Eyepiece Graticule?

An eyepiece graticule is a small glass disc featuring a finely etched scale, often spanning from 0 to 100 units. It serves as an essential accessory in microscopy by being carefully placed within the eyepiece of the microscope. The primary function of an eyepiece graticule is to provide a standardized reference for measuring objects that are being examined under the microscope. This scale aids scientists, researchers, and technicians in quantifying the dimensions, sizes, or other characteristics of microscopic specimens with a high degree of precision. Eyepiece graticules are versatile tools and can be either retrofitted onto existing eyepieces or obtained with pre-installed measurement scales, ensuring compatibility with various microscope setups and research requirements.

What Are Eyepiece Graticules Used For?

Measuring Microscopic Specimens: The primary use of eyepiece graticules is to enable scientists and researchers to accurately measure the size and dimensions of microscopic objects such as cells, bacteria, and other biological structures.
Quantifying Features: Eyepiece graticules provide a reference scale that allows for the measurement and analysis of various characteristics of microscopic objects. This includes determining the distance between specific features or calculating the area of particular structures.
Calibration: When used with a stage micrometer, graticules help calibrate the microscope. This ensures that measurements remain accurate across different magnifications.