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The National 740-160 40xR Retractable Achromat Objective Lens is for use with the 160 and 165 microscope series. It features a 0.65 numerical aperture and 40x magnification. A retractable achromatic objective lens provides additional protection against lens or slide damage.
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National 740-160 40xR Retractable Achromat Objective Lens Review