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National Optical, 720-160P, DIN 40x Retractable Objective Lens, 0.65 N.A.
The National 740-045 40x Retractable Objective Lens is for use with the 110 and 130 microscope series. It features a 0.65 numerical aperture and 40x magnification. A retractable objective lens provides additional protection against lens or slide damage.
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