Feature 1STANDARD SIZE: This objective lens has universal 20.2mm standard RMS interface thread, suitable for most biological microscopes, has good compatibility. 2CLEAR IMAGING: This infinite objective lens has a clearer and sharper image, and a wider field of view than a regular achromatic objective lens. 3PARALLEL BEAM: The infinite objective lens is parallel optical beam, with no included angles, correction of spherical and sunken errors, has accurate imaging. 4COATING FILM LENS: The 4X objective lens is coated, has high transmittance and refractive index, making it less prone to scratches, fragmentation, or wear. 5METAL STRUCTURE: The microscope objective lens is made of excellent brass and stainless steel, wear and oxidation resistance, have a longer service life.Item Type: Objective LensMaterial: Brass, Stainless SteelUse: International standard RMS sizethreadinterface, suitable for most professional biological microscopes on the marketSpecification: 4X .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Objective Lens1 x StorageCylinder