These Jigs hold a microscope from amazon that we have worked to help people be able to work their shoes withuot straining into the light. There are 2 versions, one for scale engineering and one for RT-HO setup blocks.
MicroScope must be purchased seperately
This allows the user to use a USB-C connection for iphone or android to see their shoes.
The Youtube Video shoes how it is used and basic shoe setup, link here: Video Link
The Microscope to purchase to make this work is here: Microscope Link
To use with older Iphones you may need a lightning to USB-C adapter