Reticles / Eyepiece Micrometers

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Short Description

Microscope micrometers are commonly used for measuring or counting specimens. Eyepiece micrometers (also referred to as "reticles") are small glass discs with markings on them. The micrometer is mounted in one of the two eyepieces and superimposes an image of the markings over the image of the specimen. Stage micrometers are slides with markings of a known dimension that, when viewed under the microscope, can be used to calibrate eyepiece micrometers.

Introduction

Microscope micrometers are commonly used for measuring or counting specimens. Eyepiece micrometers (also referred to as "reticles") are small glass discs with markings on them. The micrometer is mounted in one of the two eyepieces and superimposes an image of the markings over the image of the specimen. Stage micrometers are slides with markings of a known dimension that, when viewed under the microscope, can be used to calibrate eyepiece micrometers. Calibration instructions are available here.


Features

What size of reticle do I need? How do I install an eyepice micrometer?

1. Remove the eyepiece from the microscope viewing head:

2. Flip over the eyepiece, remove the reticle holder from the eyepiece base by unscrewing the ring:

3. Measure the internal diameter of the reticle holder (where the reticle sits on). You will see a small step or ridge inside the ring (red arrow points to that).

 

 4. Now you can install a new reticle, while you carefully place the reticle on the ridge.

Specification

Description

Microscope Micrometers /Eyepiece Reticles

 


Microscope micrometers are commonly used for measuring or counting specimens. Eyepiece micrometers (also referred to as "reticles") are small glass discs with markings on them. The micrometer is mounted in one of the two eyepieces and superimposes an image of the markings over the image of the specimen. Stage micrometers are slides with markings of a known dimension that, when viewed under the microscope, can be used to calibrate eyepiece micrometers.


Calibration

Since the size of the eyepiece micrometer image (e.g. a linear scale) appears the same even though the specimen can be magnified to a greater or lesser degree, the markings on the micrometer do not by themselves indicate any particular measurement. When a stage micrometer with known dimensions is viewed through an eyepiece micrometer, however, the measurement indicated by the eyepiece micrometer at that magnification can be noted and later used to make accurate measurements.microscope micrometer
 

Eyepiece Micrometers

Its diameter needs to be specified before order.
Normally it is 19mm or 20mm for biological microscope eyepiece, and d= 24mm or 25mm for stereo microscope eyepiece.
 

Models to choose:

Part # Description diameters Picture Ref.

BR-C19

BR-C21

BR-C25

Cross-line reticle, 21mm diameter, 1mm thickness, 25 micron line width

Cross-line reticle

19

21

25

 

BI279

BI523

BI284

BR-L1021

BR-L1025

Linear scale, 10mm divided into 100 units

21

25

 

BI255

BI506

BR-L0521

BR-L0525

Linear scale, 5mm divided into 100 units

21

25

 

BI256

BI509

BR-G10021

BR-G10025

Counting grid, 10mm square divided into 100, 1mm squares

21

25

 

BI283/05

BI510

BR-G40025 Counting grid, 10mm square divided into 400 0.5mm squares 25

BI524

BR-CG21

BR-CG25

Cross-line with 0.1 mm graduations

21

25

 

BI539

BI540

BR-T25 Grain Sizing Reticle for Steel 25   BI738

BR-W19

BR-W21

Walton & Beckett reticle, 19 or 21 mm diameter

19

21

  BI254/05


 

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