Originally posted by Siegfried67:

I can't imagine a tool doing that without feeling out of place. SO probably not a tool you could equip, but rather a hotkey to show the circles around every workbench or crafting station. This way it can be usefull to see what area isn't covered by a stonecutting table (usefull while building large stone buildings), or isn't protected by a ward.

Like a crystal that colors protected area green if you use it like glasses