This is a brand new wide field 10X microscope optical eyepiece. The installation diameter of eyepiece is 30mm. The field of view is 23 mm. It fits most common biological microscopes.Features:1. 100% brand new and high quality2. High eyepoint, wide angle eyepiece lens3. Suitable for biological microscopy with the interface of 30mm4. Magnification is WF10X, and the field of view is 23mm5. Image bright and clear, the effect is clearer.Specification:Condition: 100% Brand NewItem name: Microscope EyepieceMaterial: Optical lens + aluminum alloyMagnification: 10XInstallation thread diameter: Approx. 30mm / 1.2inField of view: Approx. 23mm / 0.9inPackage list:1 * Microscope Eyepiece.Note:Please note that the new type and old type of this product will be sent randomly and make sure you will not mind before ordering.