0.5X to 2X Barlow Lens Set For SM Series Stereo Microscopes (48mm) – AmScope
0.75X Auxiliary Objective Lens for Stereo Microscope D48mm – Omax
KiZHXlo Monocular Microscope 40X-1600X Magnification with Barlow Lens for Students Adults, Dual LED Illumination, with Science Kits Beginners Microscope Includes Phone Adapter - Walmart.com
Amazon.com: AmScope SM05 0.5X Barlow Lens For SM Series Stereo Microscopes (48mm) : Electronics