Amscope sm20 2x super widefield barlow lens for sm and sw stereo microscopes (48mm) this is a brand new 2x barlow (auxiliary objective) lens for amscope sm and sw series stereo microscopes. Give your microscope a boost with greater power & clarity at a fraction of cost. It doubles the magnification power of the microscopes. It comes with a 1-7/8" (48mm) mounting thread.
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