ML421N BLK DOTPR 9PIN PAR USB ETH (E/F/P/S) 120V Engineered for dedicated forms printing in the most demanding point-of-sale, automation and utility environments, ML421 series printers are right at home in applications such as retail sales counters, medical facilities, automotive rental and repair shops, airline boarding gates, financial departments and manufacturing sites. Their print speed and versatile paper handling make them ideal for the office, too.