570 cps Mono - 240 x 216 dpi - Parallel, USB The OKI wide-carriage counterpart ML421 is a quantum leap forward in Impact printer performance. Engineered for dedicated forms printing in the most demanding point-of-sale, automa-tion and utility environments, ML421 printers are right at home in applications such as retail sales counters, medical facilities, automotive rental and repair shops, airline counters, financial departments and manufacturing sites. Its print speed and versatile paper handling make it ideal for the office, too.