Just a heads-up: the documentation still refers to version 2.2, but the current version of the addon is 2.7
Select Normal
Selects according to the normal of the geometry.
Settings
Domain mode – Points, Edge, Face, Face corner
Invert – Invert the selection
X/Y/Z – Selects according to the normal of the geometry
Threshold – The direction of the normal deviation threshold
Absolute – takes into account negative values
