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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 2mm 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.