Precision FMP Metal Ruler,It is a complement with the App: "Flat Metal Patterns".By using the App in conjunction with the ruler it will help you: • Apply readings of the drawing plans that the Engineer sends you.• To make your patterns with greater precision.• Remember that the App returns the results of the patterns in precision of 16ths, 32nds and 64ths.• Remember that if you do not use precision you may have errors of ½” up to 7”, for example if you make a “TEE” pattern and in the length of the pattern, you have an error of 1/8” then when turning the pattern, to get the entire pattern, you will also turn the eighth of an inch, which would be a total of 1/8” X 4 = ½” which would be the error in the entire pattern. and at the end of the day the entire pattern would be ½” larger at the time of installation.• In the same way for patterns with many pieces to install, for example in head sections, if we have an error of 1/8” in the width of the head section, and if the number of head pieces is 40. Then we will have an error of 40 X 1/8”= 5” Which means that we will no longer be able to close the head with 40 pieces.• Another example would be the 90's in segments, which applies to the same example of the head segments.• The ruler readings are from Left to Right.• The zero line is inside the ruler, and not on the edge, which will help you sit your compass freely and move it to the right.• Use the Ruler up to 12” in its normal state.• Use the Ruler up to 24” in its Foldable state.• The Ruler is capable of drawing a circle, with a circumference reading.• Trace circles up to 151” in circumference.• The precision of the circumference readings in inches is: 8ths and 4ths.• Scan the QR code for a video explanation of how to use the FMP rule. The dimensions of the Rule are:Length: 12 3/8”Width: 1 1/8”Thickness: .8mm