This plumber's rule is based on 45° offsets. One side of the ruler has regular inch and fraction dimension but the other has dimensions scaled to the elg of a 45° triangle or offset. It is so quick and easy to determine the set, travel and run of a 45° angle offset with this ruller.
Dimension-5/8″ x 6 footTwo sides: Regular scale/45°scale
To determine the length of the long side (Hypotenuse) of a 45° right triangle, place your thumb nail on the length of the leg on the regular scale and turn the ruler over. The length on the 45° scale side is the length of the longest side (hypotenuse). To find the length of the leg, place your thumb nail at the correct measurement on the 45° scale side and turn the ruler over and read the regular scale.
For example, look at the rules on the left. Notice that 3″ on the regular scale aligns with 4 1/4″ on the 45° scale.
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