10X Eyepiece with Scale & Crosshair Focussing FN18mm Fits 23.2mm Diam. Tube

This eyepiece has a scale running horizontally across the majority of the field of view and a vertical line to form a useful indicator crosshair.  It is a focussing eyepiece meaning that it can be extended in length to make sure that the reticle scale is in focus at the same time as the subject under examination.  It will fit into any eyepiece tube with 23.2mm inner diameter and, if used on a binocular microscope it should be matched with the other eyepiece to make sure it has the same field number. The  scale is 10mm  with 100 divisions.