Sphygmomanometer is used for
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Voltage Spike measurement
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Blood pressure measurement
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Retinal thickness measurement
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none of the above
A sphygmomanometer is a medical device specifically designed to measure blood pressure. It typically consists of an inflatable cuff and a measuring unit to determine systolic and diastolic pressure readings.
A sphygmomanometer is the classic medical instrument (an inflatable cuff plus a pressure gauge or mercury/aneroid manometer) used to measure blood pressure by occluding and then gradually releasing arterial flow while listening for Korotkoff sounds or reading a digital sensor. It has nothing to do with electrical voltage spikes or retinal thickness (that's tonometry/OCT, used in ophthalmology). This is a standard general-knowledge/medical-terminology fact.