Digital Pocket Scale (for iPhone)

The following is a request for an experienced Apple app designer to develop a concept app that would transform the iPhone into a digital pocket scale that would weigh ounces and grams (up to 500 grams). The concept app would allow for iPhone users to place small items (e.g. jewelry) directly onto the iPhone's touch screen to have weighed in ounces and/or grams. The app is envisioned to be similar to the iPhone's calculator app in that when the user rotates the iPhone, to enlarge the viewing screen, they would have a touch screen option of weighing their items in either ounces and/or grams (up to 500 grams). This is a straight forward app and I look forward to reasonable bids from talented app developers with Apple app development experience. Please bid on developing this app ONLY if you know that you have the expertise to write it correctly. This app will be for publish in the Apple App Store. Good luck! Ryan