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Vision Scientific VMLIFR-09B Black Adjustable 144 LED Ring Light for Stereo Microscope | 2.5" (62.5mm) Inside and 3.64" (92.5mm) Outside Diameters | 1-7/8" (48 mm in Diameter) Ring Adapter Included electronics3 Goupchn has passed the ISO9001:2015Vision Scientific VMLIFR 09B Black Adjustable 144 LED Ring Light for Stereo Microscope 2. 5" (62. 5mm) Inside and 3. 64" (92. 5mm) Outside Diameters 1 7 8" (48 mm in Diameter) Ring Adapter Included 144 LED intensity adjustable ring light for stereo microscopes with mounting size 2. 4" (61mm) in diameter. The ring light has 2. 5" (62. 5mm) inside and 3. 64" (92. 5mm) overall outside diameters. It works with power supplies from a 100 240V and comes with