SIOS stocks a range of Calibration Slides and Eyepiece Graticule as well as focusing eyepieces with graticules.
If you require an eyepiece graticule please advise us of style i.e. linear , squares and number of squares etc and most important the diameter required to suit your eyepiece.
We have a large range in stock or can be manufactured for us.
Calibration slides glass76mm x 25.4mm with various rulings
Download Calibration slide:Calibration Slides pdf