@Sofie1212, some shopkeepers allow their customers to test the pot properly before buying, but you have to know what you are doing well and ask permission first, because hitting a piece of ceramic for sound can mean breaking the piece, many would not allow any customers to do that. Trust would need to be established first.
However, if you are beginning, I think it is better to buy a few not so expensive ones and explore them in order to know more about the basics before advancing to such ideas as density.
