This is a brand new 20X Infinity Plan Achromatic microscope objective lens. It fits DIN-standard compound / biological microscopes. We also have 4X, 10X, 40X and 100X Plan objective lenses available. Give your microscope a boost with greater power clarity at a fraction of cost. Features Specifications: Plan Achromatic Corrections Magnification: 20X NA: 0.40 Tube Length: Infinity-corrected Cover Glass Thickness: 0.17mm