Microscope Eyepiece Reticules (Graticules) 

G45 ASTM E19-46 Grain Sizing Disc

Eyepiece Reticle to ASTM E19-46

Technical Specification

Circular pattern with 10 different segments each with a progressively smaller pattern for grain size analysis.
 

Image Diameter
15mm

Glass Type and Thickness
Soda Lime 1.5mm thick

Diameter Tolerance
+0/-0.1mm

Orientation
Correct reading through glass