Paperless printing calculator with a 12-digit display features a unique, powerful design that combines the power of a printing calculator with the functionality of a desktop calculator. The large five-line, secondary LCD allows you to scroll back and forth up to 300 lines to refer back to your previous calculations. Cost\/sell\/margin keys simplify profit margin calculations by allowing you to simply enter two variables to automatically show the third variable. Battery-operated design with included batteries eliminates the need for an electric cord to use this calculator anywhere you need. Contoured keyboard helps you accurately input data for easy calculations. Calculator also includes four-key memory, tax keys, change sign key, backspace key, grand total with selector, rounding function and more.