185 Achromatic Lenses for Biological Microscopes - 4x, 10x, 40x, 100x Magnification, 1 Piece (100X Objective Lens)

Magnification: 4x Lens length: 29mm; Numerical aperture: 0.1mm; Working distance: 17.35mm; Cover glass thickness: 0.17mm; No spring, no immersion medium. (See insects, paper money, repair electronic motherboards, etc.(can only see objects) image clearer than a magnifying glass. Product Name: 185 Achromatic Lenses for Biological Microscopes 10x; Lens length: 31mm; Numerical aperture: 0.25mm; Working distance: 2.04mm; Cover glass thickness: 0.17mm; No spring, no immersion medium. (See mites, look for image, preliminary explanation) 40x; Lens length: 38mm; Numerical aperture: 0.25mm; Working distance: 0.56mm; Cover glass thickness: 0.17mm; With spring, no immersion medium. (See cells, blood, , eggs, artificial insemination, etc. on.) 100x; Lens length: 38mm; Numerical aperture: 1.25mm; Working distance: 0.18mm; Cover glass thickness: 0.17mm; Spring, dipping medium: oil (tests, blood tests, bacteria, scientific research, students see samples, etc.)