This eyepiece reticle measures 20mm in diameter and is compatible with our E400 eyepiece. This reticle has a linear scale that is 10mm in length with 0.1mm increments for a total of 100 units.

*Please note: In order to calibrate your reticle, a stage micrometer is required (sold separately). One must compare the marks on the stage micrometer to the reticle to determine the actual value.