How to determine if your eyepiece accepts a reticle:
|Bottom of the eyepice.|
Not all microscope eyepieces are fitted to accept a reticle. In order to figure out if yours does, follow these instructions.
Remove your eyepiece from the microscope and look into the bottom of it. If your eyepiece accepts a measuring reticle, you will see a retaining ring that can be removed.
How to measure the correct diameter of reticle required:
|Reticle Retaining Ring|
How to determine what type of microscope reticle to purchase:
Determine if you would like to measure in mm or inches. Also, keep in mind that when using a ruler reticle, the distance that is between the lines when looking through the microscope follows this formula:
Reticle Division ÷ Objective Lens Value = Distance Between Lines
The magnification of the eyepiece itself has no affect on the reticle divisions you will view. For example, if your ruler reticle is 10mm with 100 divisions, your reticle division is 10 ÷ 100 = 0.1mm.
When using the 4x objective to make measurements with the above mentioned reticle, your distance between lines when measuring is: 0.1mm ÷ 4 = 0.025mm.
When using that same reticle with the 100x objective lens the distance between lines is 0.1mm ÷ 100 = 0.001mm.
Many specialized microscope reticles are available including comparator reticles, grain sizing reticles and concentric circles.
Once you have purchased your reticle, you will want to calibrate your microscope. Learn more about calibrating your microscope here.