LSelect

The LSelect tool, found in the Select sub-menu, is used to loop select edges based on a minimum angle parameter. This can produce much better results compared to Blender's native loop select, which is aimed at loop selecting all-quad topologies.

Also see the Select tool, for a more convenient way to access LSelect.

Selection

One or multiple isolated selected edges.

Using LSelect

Keep in mind

The Min Angle behavior shown in the video has been inverted in MESHmachine 0.8, leading to a better UX.
Increasing the value will now grow the selection.