Original Casio WD-220MS-BU 12-Digits Desktop Calculator is the right size and have functions suitable for use in shops and field. Featuring easy Tax and Cost/Sell/Margin calculations. Dual powered with solar & battery. Plastic keys designed and engineered for easy operation. With this water- and dust-resistant calculator, there’s no need to worry about exposure to water, dust, or grime. It is recommended for use even at open-air markets, street stalls, and other outdoor businesses and at shops that sell fresh food.