Microscope Eyepiece Reticules (Graticules) 

NE71 Indexed Grid 0.5mm Squares

Eyepiece Reticle with 20x20 Indexed Grid pattern, 10mm x 10mm grid with 0.5mm squares, marked 1-20, A-T

Technical Specification

Line Thickness
0.013mm +/-0.003mm

Glass Type and Thickness
Soda Lime 1.5mm thick

Diameter Tolerance
+0/-0.1mm

Overall Tolerance
+/-0.005mm

Orientation
Correct reading through glass