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As we move the gauge around, we can confirm that none of the indications exceed our two-millimeter limit. Now, let’s compare this to a standard 2D Circle Gauge. To start, we must manually establish a relative base measurement—in this case, the 10 milimeter pipe diameter. Once we overlay our 2 milimeter circle, the limitations become clear. This technique cannot correct for distortion at the corners of the picture, and it fails to follow the actual contour of the pipe.