Microscope Eyepiece Reticules (Graticules) 

G46 ASTM E19-46 Grain Sizing Disc - Root 2

Eyepiece Reticle to ASTM E19-46 Root2. Circular pattern with 10 different segments each with a progressively smaller pattern for grain size analysis.

Technical Specification

Glass Type and Thickness
Soda Lime 1.5mm thick

Diameter Tolerance
+0/-0.1mm

Orientation
Correct reading through glass