【High-quality Achromatic Objective Lens】The microscope objective lens is made of copper core, durability and reliable performance. 【Multiple Magnification Options】This set includes 4X, , 20X, 40X, 60X, and 100X achromatic objective lenses, offering various levels of magnification for different observation needs. 【Wide Compatibility】Designed for biological microscopes, these objective lenses are compatible with most standard cover glass thickness of 17mm. 【Clear Imaging】With numerical apertures ranging from 1 to 1.25, these objective lenses provide clear and imaging. Each lens also comes with a specific working distance for precise observations. 【Easy to Install】Featuring a standard RMS thread and a mount size of 2mm, these objective lenses are easy to install and compatible with most microscopes.