Feature:1. CLEAR EFFECT: Infinitesimal lens creates clearer and sharper image, and has a wider field of view than ordinary achromatic objective lens. Parallel optical, no included angle, correcting spherical error and sink error2. BRIGHT AND WIDE: Low magnification lens has larger aperture, brighter image and larger field of view3. WIDE APPLICATION: The screw interface size of the lens is the international standard 20.2mm RMS size, with a wide range of compatibility, most professional biological microscopes in the market can be used4. OPEN VIEWING: Achromatic objective makes viewing more comfortable, the lenses won't hurt, bloom, and last longer5. EXQUISITE WORKMANSHIP: The whole set is well designed with exquisite workmanship. The objective lens is coated with a higher transmittance and refractive index, and the image is brighter and clearer than other objective lensesSpecification:Item Type: Microscope Objective LensMaterial: Brass, stainless steelApplication: Wide Range of Applications, international standard RMS size thread interfac, most professional biological microscopes in the market can be usedSpecifications: 4X, 10X, 40X, 100X.Package List:4 x Lens4 x Storage Container