Description The On Glass OG 3.0 MagTab is a low-profile magnetic plate that attaches to the back of your phone or phone case for quick, repeatable connection to the OG 3.0 digiscoping system. Use the alignment tool during installation to center your phone camera with your optic for consistent alignment every time. OG 3.0 and OG Mini kits already include one MagTab, making this an ideal replacement or additional plate for another device.