Portable Mini Bubble

I present to you this very useful portable Mini Bubble that I use on site to position the plates flat. I created two seats with degrees of inclination, one of 30° and the other of 45°. While the side opposite the hole for the hook is 90°. NB: I leave it up to you which hook to use while regarding the purchase of the bubble I leave you the link: https://www.amazon.it/gp/product/B0DG7XWKBV/ref=ox_sc_saved_title_1?smid=A3R2BN8GAL312Z&th=1