How to Find Slope of a Grade with String

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How to Measure Elevation of Land, Slope, With a String and Two Stakes. I use string a line level and stakes to find the average grade of a slope. No Transit or Laser Level. Also, I include a tip and trick on how to store your string so that it doesn't get all messed up and knotted. Preventing your construction string from getting tangled up. Keep your string straight.