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Click Measure on the Toolbox.
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Click a point on the model and drag the ruler to another point for measurement.
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Click a point to display its coordinates in the model.
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Click a second point to display the distance (both the total distance and distances along each axis) between the two points.
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If the first click selects an object, double-click a second object to display the minimum distance (both the total distance and the distances along each axis) between the objects.
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At any point, you can reset the command by right-clicking to return to a previous step. By resetting, the last selected point or object becomes the starting point.
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The current measurement is displayed until you press the ESC key or select a different toolbar command.
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Measurements are displayed in English (inches) or Metric (mm) units for raster files.