The W. A. Baum mercury gravity (Baumanometer®) and Baum aneroid sphygmomanometers are medical instruments for professional use to be used by trained clinicians (e.g. doctors, nurses, nurse’s aides, trained care-givers, trained EMTs etc.) and all medical researchers to measure blood pressure. This is useful in the diagnosis and monitoring of conditions such as: hypertension, normotension, hypotension and other states of cardio-vascular health.