Casio 12 Digit Desktop Waterproof CalculatorWith 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. 12 digits, Tax calculation (Automatic calculation of price plus tax, price less tax, selling price, tax amount, and margin amount.). Cost Sell Margin (Calculate the cost, selling price or margin of profit on an