Meet the Leica DISTO E7100i: a 200ft range laser distance measure that connects to your smartphone via Bluetooth. It is dust and splash proof and captures up to 5000 measurements on full battery. The device has an area mode to measure the area of a rectangle or square in two shots.
The device is 0.9″ thick and weighs 3.25 ounces. It is compatible with smartphones and tablets.