Microscope Eyepiece Reticules (Graticules) 

NE57C Miller Squares Ratio 10:1

Eyepiece Reticle with Miller Squares pattern, 8x8 mm large square with centered smaller square, ratio 10:1

Technical Specification

Line Thickness
0.020mm +/-0.002

Glass Type and Thickness
Soda Lime 1.5mm thick

Diameter Tolerance
+0/-0.1mm

Overall Tolerance
+/-0.010mm

Orientation
Correct reading through glass