Thursday, April 2, 2015

What is a Microscope Reticule?

A microscope reticule (also known as a reticle), is a small piece of glass inserted into the microscope eyepiece for counting or making measurements. This small circular glass disc has an image imprinted on it such as a grid, protractor or ruler. There are a number of different types of microscopy reticules, and each is explained briefly below. Click on the link in order to view a wide variety of reticules in each category.

Ruler Reticules

Microscope ruler reticuleMicroscope ruler reticles are the most popular type of reticule used and are ideal for making basic measurements. Available in both mm and inches, the ruler reticules can be NIST certified for precise measuring that meets certifiable standards.

Grid Reticules

Microscopy grid reticle.Microscope grid reticles are frequently used for counting or measuring cells or particles. Measuring particles and cells is made easier, especially if the required task is a pass/fail task. By knowing the size of the grid and whether a particle or cell fits within that grid can make the job of viewing multiple samples at one time more efficient and timely.

Comparator Reticules

Microscopy comparator reticleMicroscope comparator reticles are typically used for measuring angles. Similar to a protractor, the comparator reticle is available with or without a ruler printed beneath it.

Crossed Scale Reticules

Microscopy crossed scale reticle.Microscope crossed scale reticles are similar to ruler reticles, but have rulers on each of the four axis points. These reticles are useful when needed to measure in several directions from a center point.

Cross Line Reticules

Microscopy cross line reticules.Microscope cross line reticles typically do not have measuring features on them. These microscopy reticles are cross lines, or cross lines with multiple angles, such as a pie.

Concentric Circle Reticules

Microscopy concentric circle reticules.Microscope concentric circle reticles are used to measure tolerances from a central point. By using concentric circles, the distance between each circle on the point is a known distance and making measurements of tolerances is much easier.

Grain Sizing Reticules

Microscope grain sizing reticle.Microscope grain sizing reticles are used for measuring twine, austenite, carbide, brass, and copper. Additionally grain sizing reticles that meet ASTM E112 grain counting standards, Methods ASTM E-45 A, D and E method, and ASTM C method are reticles that meet specific industry standards.

Whipple Reticules

Microscopy whipple reticles.Microscope whipple reticles have a grid system that usually contains a grid within the main grid. Whipple reticles are intended to enable the measurement of smaller specimen features such as pigment dispersions, colloidal particles, dust, and bacteria.

Point Array Reticules

Microscope point array reticles and point cross array reticles.Microscope point dot array and point cross array reticles are used for counting.

Merz Reticules

Microscopy Merz reticles.Microscope Merz Reticles are used to estimate the three dimensional surface areas or the surface density of a component in a given volume, when the component does not have a random orientation. It comprises a test system with parallel curved lines used for measuring the intersection of points.

Pinwheel Reticules

Microscopy pinwheel reticles.Microscope pinwheel reticles are much like the name - a pinwheel with a measuring ruler on each leg of the pinwheel.

Specialized Counting Chamber Reticules

Microscopy counting reticles.Microscope counting reticles include everything from Birnell Scale, Dargie reticle, dirt estimation reticle, Fairs Analysis reticle, Howard mold counting reticle, hole gage reticles, milk smear, Reticulyte counting reticles, Walton & Beckett reticles, Patterson globe reticles, IMA/USP counting reticles, Miller Disc square reticles, Weibel reticles and Porton Counting reticles.

Square Reticules

Microscope square reticles.Microscope square reticles and concentric square reticles are commonly used to measure set dimensions.

Once you have your microscope reticle, read this page to find information about how to accurately measure with your reticle.

If you are looking for a particular type of microscope reticle and don't see mention of it on this page, please contact Microscope World, as we carry a number of reticles that are not listed here, as well as custom microscopy reticles.