Source:http://linkedlifedata.com/resource/umls/id/C0182914
UMD: Recorders that store information in the form of a graph, either in electronic format or as a permanent document (i.e., hard copy) for visual inspection. These recorders may include a paper chart driven at constant speed by an electric motor and a pen that moves back and forth in response to the signal, a printing array (e.g., thermal, electrostatic), or another device for printing on paper.