Features: This product is made of new high quality optical lenses and aluminum alloy, which is sturdy and durable. The wide-angle lens has a large viewing angle, a wide field of view, and a high viewpoint, and the observation effect is better. The magnification is WF10X, the field of view is 18mm, the image is bright and clear, and the effect is clearer. The built-in reticle wire is more conducive to adjusting the angle of the object and calibrating the position of the measuring object for easy observation. With a mounting size of 23.2mm, it is suitable for most biological microscopes on the market. The installation method is simple and very practical, which can help you to observe better. Specifications: Condition: 100% Brand New Material: Optical glass, aluminum alloy Magnification: WF10X Field of view: 18 mm Installation size (diameter): approx. 23.2mm / 0.9in Package list: 1 * Eyepiece 1、This product is made of new high quality optical lenses and aluminum alloy, which is sturdy and durable 2、The wide-angle lens has a large viewing angle, a wide field of view, and a high viewpoint, and the observation effect is better 3、The magnification is WF10X, the field of view is 18mm, the image is bright and clear, and the effect is clearer 4、The built-in reticle wire is more conducive to adjusting the angle of the object and calibrating the position of the measuring object for easy observation 5、With a mounting size of 23.2mm, it is suitable for most biological microscopes on the market