pyvista_cad.CadDataSetAccessor.units# property CadDataSetAccessor.units: str | None# Canonical unit string or None. Returns: str or NoneThe cad.units field-data string, or None. Examples >>> import pyvista as pv >>> import pyvista_cad >>> mesh = pv.Sphere() >>> mesh.cad.units = 'mm' >>> mesh.cad.units 'mm'