Sharp Edges

The Sharp Edges tool identifies sharp edges on faceted and solid bodies, but it does not fix them.

Click the Sharps tool
Based on the options settings, if any sharp edges are found, they are highlighted

The following options are available for finding Sharp Edges:

Max edge angle	This applies to the angle between normals of faces that share an edge. Any edges with an edge angle greater than the specified angle will be found.
Convex	Convex sharps are found. These are sharps that point outward.
Concave	Concave sharps are found. These are sharps that point inward.