Ugo Basile offers demonstations via zoom free of charge and in addition this in-depth presentation video shows the main questions and results of the inventor paper and an overview of how the TGR is built and works:
https://www.youtube.com/watch?v=FZO3aP96WVs
Learn more on Thermal Gradient Ring: https://ugobasile.com/products/categories/pain-and-inflammation/new-thermal-gradient-ring-tgr-zimmermann-s-method-2-0