it would be great if you stick an old bank card somewhere. later in 3d scene it will become a great reference to get real size of the object. for example, when i used trial version of kiri engine, it was incredibly helpful https://imgur.com/a/QYc5am7
@gnssstylist yeah, i've heard it in the video. i mean it could be a great habit. when i download 3d scans from web, it is mostly out of scale. and authors either don't remember actual scale or they don't respond at all. and bank cards are the same all over the world.