Hi, I was wondering if there is an iPad application for marking up and commenting on pdf's. I'm an engineer and when I go to do an onsite inspection of the completed job I need to be able to mark off devices on the drawings. The way I do this now is with paper and different colored highlighters. I know I can get a tablet laptop and use Acrobat or Autodesk Design Review. I'd like to get an ipad since they are smaller and lighter than tablet laptops. Any suggestions on what app would be able to do what I need it to? I've searched online for an app description and havent found one yet. Thanks!