Features Good material: It adopts premium aluminum alloy material, is not likely to break, and also has excellent durability for long-term use. Auxiliary Lens: Able to extend the working distance and field view of the microscope, this objective lens will simplify your work. Perfect Combination - Perfectly fits the SM series stereo microscope, the auxiliary lens is a good replacement for the old and damaged part. EASY TO INSTALL - Comes with compact size and light weight, convenient installation can be completed quickly in minutes. Clear Visualization: 2X magnification allows for clearer viewing of the object, which will also give you more enjoyment in observation. Specification: Item Type: Auxiliary Lens Model No.: WD30 Material: Aluminum Alloy Function: Microscope Accessory Magnification: 2X Package List: 1 x Auxiliary Lens Package List 1 x Auxiliary Objective Lens