10X Widefield Focussing Eyepiece with 100 divn reticle scale and crosshair for 30mm eyepiece tube

10X Widefield Focussing Eyepiece with 100 divn reticle scale and crosshair for 30mm eyepiece tube.

Used for measurements this eyepiece overlays a crosshair with a graduated horizontal line which is divided into 100 divisions.  For a given magnification users can calibrate their microscoppe by measurng the distance between each division (using a graticule scale).  Once calibrated for each desired magnification the user can quickly meaure features under observation using the scale.

The focussing element of the eyepiece is absolutely vital as it ensures that the reticle scale is in focus at the same time as the subject. (This focussing element is in addition to the diopter adjustment on the eyepiece tube and uis a different principle).