10-28-2013, 11:11 PM
A carpenters combination square placed on the ground works for me. You slide the gauge down to the bottom to form a right angle. Place it on the floor with ruler facing up. Read slack. And you can use it for a lot of other stuff in the workshop. You may already have one in your kit.
Like this:
[url=http://www.restockit.com/swanson-tools-16-comination-square-%28698-tc134%29.html?source=IDx20111014x00001g&utm_source=IDx20111014x00001g&utm_medium=paid&utm_campaign=gpla&gclid=CNLxu9aOvLoCFY6Y4AodNVgAYg]Combination Square
Like this:
[url=http://www.restockit.com/swanson-tools-16-comination-square-%28698-tc134%29.html?source=IDx20111014x00001g&utm_source=IDx20111014x00001g&utm_medium=paid&utm_campaign=gpla&gclid=CNLxu9aOvLoCFY6Y4AodNVgAYg]Combination Square