Purpose: They are additional accessories that increase the working distance of the microscope or increase the magnification of the microscope. Suitable for video microscopy. Purpose: Enhance microscopic viewing with multiple magnification options Compatibility: Ideal for stereo microscopes with 48mm thread Mounting Thread: 1-7/8inch (47mm/48mm) Magnification Power: 0.5X, 0.7X Working Distance: 165mm, 120mm Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:plastic Package Contents: 1 x 0.5X microscope (screw opening diameter 48MM) 1 x 0.7X microscope (screw opening diameter 47MM) Only the above package content, other products are not included. Note: Light reflection 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.