Rotomatic measuring tool for blind people.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...l_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...uring_tool.jpg
Demonstrated by blind woodworker John Furniss. 0:56 video:
https://www.youtube.com/watch?v=iXSXStnFNI0
Previously:
https://www.homemadetools.net/forum/...346#post122023
https://www.homemadetools.net/forum/...662#post147694
https://www.homemadetools.net/forum/...3848#post78856
