view is also expanded, which is not only comfortable to watch, but also has a wider field of view and clearer imaging. Product Description: Magnification: 25X Field of View: 12mm Mounting Size (in diameter): 23.2mm Lens Material: Glass Shell: Metal Microscope: Biological Microscope Special reminder: This eyepiece is equipped with professional biological microscopes, with a diameter of 23.2mm. Not all microscopes can be used. Please do not buy this eyepiece if you use a toy microscope! (The diameter of the simple and toy microscopes on the market is 20mm or other sizes, which does not match this eyepiece) Please allow 0-2mm error due to manual measurement. Due to different batches, shooting angles, and lighting, there may be slight differences between the actual product and the picture. This does not affect normal use. Material: Metal colour: black Package Contents: 3 x Biological Microscope Eyepiece