Features WIDELY USED: The objective lens feature standard RMS thread, most professional biological microscopes on the market can be used. CLEARER AND WIDER: objective features parallel optical pathway, with no included angle, correction of spherical or sunken errors, resulting in clearer and sharper images, and a wider field of view. LOW MAGNIFICATION LENS: The low magnification lens of the microscope objective have a larger aperture, brighter imaging and a larger field of view. COATING TREATMENT: This objective lens have been coated and has a high transmittance and refractive index, making the image brighter and clearer than other objectives. COMFORTABLE VIEWING: Objective lens make viewing more comfortable, the lens will not be damaged or blossomed, and the service life is long. Specification: Item Type: Objective Lens Material: Brass, Stainless Steel Use: The thread interface size is an international standard RMS size, and most professional biological microscopes on the market can be used Specification: 40X Package List:1 x Objective Lens1 x Storage Box Package List 1 x Infinity Objective Lens 1 x Storage Box