| Summary | Compact, narrow (ML390) / wide (ML391) carriage dot matrix with push tractor / paper park. |
| Print Speed 10CPI (CPS) | Draft: 390, Utility: 260, LQ: 87 |
| Printer Language | Epson FX, IBM Graphics |
| Paper Input standard | Rear Push Tractor |
| Paper Input optional | Pull Tractor kit, Push Tractor Kit, Paper Roll Holder (ML390) |
| Paper Size | ML390: Tractor: 76 to 254mm, ML391: Tractor: 76 to 406mm |
| Paper Thickness | Original + 3 parts |
| Interfaces standard | USB, Parallel |
| Interfaces optional | RS232 Serial, Internal Network |
| Dimensions / Weight | 117H x 399W x 355D, 7kg / 117H x 550W x 355D, 9.5kg |
| Warranty | 1 year return to base |