HP DesignJet T830 Multifunction ‎  • Multifunction: Allows printing, scanning, and copying of large-format documents (like A0 and A1 sizes). * High Resolution: Designed for printing technical drawings and CAD designs with precise detail. * Integrated Ruler: The part with measurements (like ARCH and ISO) visible in your image is part of the feed or scanning mechanism to help the user accurately align the paper to the correct sizes.