Paperless printing calculator with a 12-digit display is a unique, powerful calculator that's great for those that need the power of a printing calculator with the functionality of a desktop calculator. Five-line, secondary LCD lets you scroll back and forth up to 300 lines to refer back to your previous calculations. Check and Correct function allows you to quickly modify and recalculate entries for fast, simple updates. Cost/sell/margin keys simplify profit margin calculations by allowing you to simply enter two variables to automatically show the third variable. Whisper-quiet operation allows convenient use in any office environment. Paperless printing calculator also includes four-key memory, tax keys, change sign key, backspace key, rounding keys, selectable decimal and more.