There are many designs of feng shui luopan/compass used for feng shui master.
Chinese Feng Shui Compass (Lou Pan) For serious Feng Shui masters. This is a must in your tool box of Feng Shui Tools. The compass is made of wood and brass with red thread to help you read the align measurements accurately. Writting is in chinese and contains secret code that can only be deciphered by those studying under Feng Shui Master.