The 12-digit P170-DH calculator incorporates two-color, high-speed printing, and a non-add print key for dates and reference numbers. Print 2.3 lines per second with positive numbers in black and negative numbers in red. Design features an extra large, high-angled fluorescent display and quiet serial impact printer with ink roller. Functions include time calculation, profit margin calculation, clock/calendar function, quick tax calculation, decimal positions (+, 0, 1, 2, 3, 4, floating), round up/off/down switch, sign change, item count, markup/markdown, memory, add mode and grand total. Calculator uses a 2-1/4" (57mm) wide plain paper roll and weighs 2 lb.