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 optionsCompatibility: Ideal for stereo microscopes with 48mm thread Mounting Thread: 1-7/8inch (47mm/48mm)Magnification Power: 0.5X, 0.7XWorking Distance: 165mm, 120mmNote:Installation guide not included, we strongly recommend you seek 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 UseColour:Photo ColorMaterial: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.