Formation level of point A 130.00m and ground level at A is 132.265m, Height of instrument is 134.255. Then grade rod is?'

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Contouring in surveying is the process of determining the elevation of various points on the ground and drawing contour lines on a map.


Formation level of point A 130.00m and ground level at A is 132.265m, Height of instrument is 134.255. Then grade rod is?'