✦Please be sure to read the profile before purchasing or asking questions ✦ This is a 30cm scale for drafting. It is believed to have been used by my architect parent. It appeared for some reason, even though there are no drafts... Nowadays, I think everyone only does drafting with CAD on a PC, but I'm offering it for sale in case anyone would like to use it. The tile scale in image 1 (with a 20cm ruler) is an extra. If you would like it, please let me know in the comments.