Increase the working distance of the microscope Additional accessories to increase the magnification of the microscope Clear imaging Applicable : suitable for , suitable for monocular video microscopes such as Guilin Optics. Auxiliary objective reduction lens M42 thread, used for industrial microscope XDC-10A 180X lens : Electron Microscope Lens tube: single eye Suitable for: XDC-10A microscope lens Purpose: Magnify the stereo microscope, increase the working distance, and assist the large objective lens Model: 1X colour:Black Material:metal size:Interface thread M42 x 0.75 Package Contents: 1 x auxiliary objective lens Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.