Massive range of eyepiece reticle/graticule patterns for different applications and available in all sizes to fit your microscope. Graticules Optics can advise on how to fit your reticle into an eyepiece, selecting the right diameter and help you define the right pattern for your application. For custom designed reticles, simply contact us with your requirements.
See our video: How to Size and Fit an Eyepiece Reticle.
See this table for reticle diameters of common microscopes: Reticle Size Match
For a Technical Guide on Eyepiece Reticles: All About Eyepiece Reticles