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This is an intro video discussing the difference between what Bill Mollison calls a Percent Slope and what surveyors call Percent Slope. The Gauge Frame Level uses the method used in surveying, not the method used by Bill Mollison. What Bill Mollison calls Percent Slope is better described as Percent of Right Angle. There is an easy way to go between the two with the Gauge Frame Level but that will be in an upcoming video. Please feel free to comment. We will do everything we can to clarify this point.