Zebra GK420d Direct Thermal Label Printer - USB/ Serial / Parallel - GK42-202520-000. This is what Zebra has to say: -. These are direct thermal units so don't need a ribbon. 6 x 4" Label Printer. The intuitive design of the GT800 and the GK420 printers combines a choice of three connectivity interfaces and, co-resident EPL2 and ZPL II programming languages and Unicode to ensure quick and efficient integration.
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