Sphygmomanometers. (A) Mercury gauge manometers have a vertical glass tube containing liquid mercury with a 300 mm Hg scale marked in 2-mm increments. (B) Aneroid manometers consist of a circular glass-covered 300 mm Hg gauge in 2-mm increments with needle marker. (Courtesy of Omron, Inc., Lake Forest, IL 60045.) Source: Examination of Vital Signs, Physical Rehabilitation, 6e Citation: O’Sullivan SB, Schmitz TJ, Fulk GD. Physical Rehabilitation, 6e; 2014 Available at: https://fadavispt.mhmedical.com/DownloadImage.aspx?image=/data/books/1895/osullrehab6_ch2_f029.png&sec=136485232&BookID=1895&ChapterSecID=136484927&imagename= Accessed: December 26, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved