With its exceptionally clear two-color display, the Ibico 1231X sets the standard for printing from professional desktop calculators. It prints quickly at 3.5 lines per second in black and red, and impresses with its attractive design featuring clearly separated colored keys. It offers percentage and delta percentage functions, automatic rounding, thousand separators, and a double zero key. The two-color LCD display shows positive values in green and negative values in red. It calculates with time, making it suitable for payroll accounting. It features a 4-key memory, currency conversion with 13 storable rates, a dual tax function for corporate tax and VAT, a +/- sign change, a gross margin function, a programmable triple zero key, an item counter, and sigma, total, and subtotal functions. Additionally, there is a backspace key for corrections and an output for numbers and data. The print mode can be toggled between black/red, with a paper width of 57 mm.