This is a brand new 40X (spring) Plan Achromatic microscope objective lens with high quality. It is an International DIN/JIS lens. It fits common size (DIN/JIS standard) compound / biological microscopes. We also have 4X, 10X and 100X Plan objective lenses available. Give your microscope a boost with greater power & clarity at a fraction of cost. Features & Specifications: Plan Achromatic Objective 40X Magnification Power 40/0.65 Spring 160/0.17