<ul><li>Material: Optical Glass. Diameter: 18mm 20mm 24mm. Package Included: 1 x Microscope Micrometer.</li><li>All microscope micrometers are made by process and the workmanship is exquisite.</li><li>All scale is clear,non-broken lines and will not fade, so it can be reused many many times.</li><li>Perfect microscope accessories, exquisite workmanship, can be widely used in microscope. With good durability and stability.</li><li>You can reach us anytime for any query and I'll available 24x7 to assist you, have a good day.</li></ul><br><br>

Microscope Kit Optical Cross Ruler Scale Glass Lens, Grid Value Precise Micrometer Ruler, for Microscope Microscope Lens Adapters (Color : Diameter 20mm)