Reticle ASTM E-45 Method A, D, E

KR-843 glass eyepiece grain counting reticle ASTM E-45 Method A, D and E. Square is 0.280" x 0.280" (7.11mm) inside dimension. Scale is 10mm in 100 divisions. Each division = 0.1mm. Reticle is available in a number of different diameters, select below when ordering.

Lines: Chrome deposition
Chamfer: 0.010" - 0.020"
Flatness: 2 waves or better
Centering: Within 0.005"
Glass Thickness: 1.5mm+/-0.2mm
Surface Quality: 20/10
Parallelism: 2 min.

NOTE: This is a special order product. Please allow 2-3 weeks for delivery. This item is not returnable.