Measuring eyepieces

For comparison, marking and measurement purposes a variety of reticles e.g. cross lines and graduations can be inserted in the adjustable eyepiece for use with the fixed eyepiece of the same magnification.

There are reticle plates for eyepieces with plug-in diameter of 23,2mm (reticle Ø20,5mm) and plug-in diameter of 30mm (reticle Ø26,5mm). 

You can find a selection of reticle and measuring plates under the following site

Adjustable eyepiece with reticle or measuring plates