Fast and virtually silent in operation, The BP37-DTS has a well-laid out keyboard, 12 digit capacity and clear, easy-to-read liquid crystal display. With the use of three keys, the BP37-DTS performs cost/sell/margin calculations. If for example you've paid €200 for something and want to sell it at a 12.5% profit, you simply type 200 followed by the Cost button, then 12.5 followed by the Margin button. The display will show 225 followed by the word 'Sell.' This is the price you would sell at to make a 12.5% profit.