It is easy to use Unit Converter application using wheel view controller. Main Function 1. Essential 20 Units. 2. Easy to use. 3. Favorites. 4. SWAP Left and Right unit. 5. 11 Digits. 6. Support for display of negative value. Instruction 1. Select the desired unit. 2. Using the numeric keypad to enter values ​​on the left wheel. 3. Turn the wheel to set the unit can check the converted value. Reference - Using the SWAP button on the left / right side of the unit can be switched easily. - Y