Detect all special characters (ascii codes 128 to 255) on a varchar column

Detect all special characters (ascii codes 128 to 255) on a varchar column

i have a table which has a description_text column (NVARCHAR) that i need
to check for any special characters (from ascii codes 128 to 255).
What I wrote is:
SELECT cid as ID, description_id as "Element ID", description_text as
Text, 'special characters in description_text (tbdescription)' as "Error"
FROM tbdescription d
WHERE
(
description_text LIKE '%' || CHR (129) || '%'
or description_text LIKE '%' || CHR (130) || '%'
//..and so on..//
)
Which does the job, but I'm sure there is more elegant way of verifying
all these ascii codes without all the or conditions.
I use Oracle Client Version 11.1.0.6.0