-- Your iphone is just a real ruler --
- It support cm and its cm Ruler
- It support inch and its inch Ruler too.
- it support iOS 5
-- 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