12-digit calculator provides heavy-duty durability that's perfect for power users and the everyday advanced user in busy office settings. Two-color, 4.8 line-per-second ribbon printer is fast and reliable for consistently legible results. Large, fluorescent display offers easy viewing to help prevent reading errors. Professional keyboard layout with a left-side grand total key helps you quickly and accurately input data for fast calculations with minimal errors. AC-powered calculator also includes markup key, percent changes, automatic tax keys, constants in multiplication and division, grand total key, change sign key and more.