Zebra ZD420-HC Direct Thermal Printer: If you need fast 4-inch thermal printers that are easy to use, easy to deploy and easy to manage, then choose the ZD420-HC. Building on the legacy of the industry-leading GK Series printers, the ZD420 Series printers deliver features and functionality that take deployment and management simplicity to a new level. ZD420-HC printers deliver features and functionality that take deployment and management simplicity, ease-of-use and application flexibility to a new level. Available in both direct thermal and thermal transfer models, the ZD420-HC is designed specifically for healthcare with disinfectant-ready plastics, a sealed button interface and a healthcare-compliant power supply. The ZD420-HC brings reliability and accuracy for critical healthcare environments.