Note: 23.2mm universal standard interface eyepiece and wide-angle eyepiece are both 23.2mm interface size, the standard biological microscope interface size is 0.91 inches, converted to millimeters is 23.2mm. 95% of biological microscopes on the market can be used universally Warm Tips The eyepiece diameter is 23.2mm universal interface, the data is the measurement standard of biological microscopes, except for stereo microscopes Biological microscope eyepiece interface 23.2mm diameter Stereo microscope eyepiece interface 30mm diameter Different batches, different angles and lighting, there are slight differences between the actual product and the picture, which will not affect normal use Material: Metal colour: black Package Contents: 1 x Microscope 2X Barlow Lens 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. Product Description: Magnification: 2X Field of View: 15mm; Mounting Size (in diameter): 23.2mm Microscope: Biological Microscope Insert the lens barrel depth: 29mm Can be inserted into the eyepiece depth: 22mm