Riester is a well-known manufacturer of medical diagnostic equipment, including blood pressure monitors. If you are referring to a mercury blood pressure monitor from Riester, it would likely be a traditional sphygmomanometer that uses a column of mercury to measure blood pressure.
Here are some general features you might find in a Riester mercury blood pressure monitor:
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Mercury Column: Utilizes a vertical column of mercury to indicate blood pressure levels.
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Cuff: The inflatable cuff is wrapped around the patient's upper arm and connected to the mercury column.
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Glass Tube: The column of mercury is housed in a glass tube with a calibrated scale for measuring blood pressure.
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Bulb: A hand-operated bulb is used to inflate the cuff.
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Valve: A release valve allows for controlled deflation of the cuff.