-- Your iPad is just a real ruler--
- It support cm and its cm Ruler
- It support inch and its inch Ruler too.
- It also support iOS 5
- It support both IPad and IPad 2
-- Easy to use --
- One side is cm ruler. The other side is inch ruler
- Two figure can walk with drag. Its easy for alignment with ruler
- Two figure can walk with drag. They can tell their coordinate
- Two figure can walk with drag. They can display the distance between them