Almost always when working with carpentry machines, you need a "zero" or reference point, in relation to which the processing is done by cutting, milling, scraping, etc. By "Zero point" we usually mean the position of the cutting tool in which its most protruding point is flush with the worktop.
I came up with this idea of making this useful device while I working with my Premium Homemade Router Table.
In addition to desktop routers, this tool can be used on table saws and other machines where the worktop is not made entirely of metal. It can also be used on metal worktops of machines, if there are electrically non-conductive parts, such as zero-clearance in table saws.