Not like regular 3D CAD modelling (aka forward engineering), reverse engineering requires a different workflow. Check these features that you might not get from your caliper.
Mesh2Surface for Rhino® provides two versions: Premium & Standard.
The Premium version is equipped with all reverse engineering tools for both industrial products and organic shapes. Standard version inherits the features for the "industrial" part from the Premium version, but doesn't have the organic reconstruction capabilities. See the detailed comparison HERE.