Bidspirit auction | W. A. Baum Baumanometer 300

W. A. Baum Baumanometer 300 Mercury - 13.5 in. Long. A Baumanometer 300 Model mercury-gravity sphygmomanometer produced by the W. Baum Co., Inc. The instrument is housed in a portable metal case with a textured gray finish. The interior lid features a vertical glass manometer tube containing liquid mercury, set against a black and white metal scale calibrated in millimeters of mercury (mmHg) from 0 to 300.