Sphygmomanometer measures.

Hint: A blood pressure- a normal and healthy human being should have in the range of 90 to 120 mmHg. Sphygmomanometers measure the cuff’s pressure or the tension in arteries. Sphygmomanometers can be of three types.

Complete answer:
A sphygmomanometer is a word derived from the Greek word ‘sphygmos’ which means beating of the heart or the pulse. For determining the blood pressure containing an inflatable rubber cuff Sphygmomanometer is the instrument used for this purpose. To the arm the instrument is connected and is connected to a mercury level in the graduate scale. Thus, is the right answer. Blood pressure is often expressed as a fraction containing a top number and a low number. For example-
Systolic Pressure: The top number of this fraction represents the pressure in our arterial walls when our heart muscle lies in the state of contraction.
Diastolic Pressure: The pressure of the blood when our heart muscles lie between beats has been referred to the bottom number of this fraction.

Note:
In conjunction with a stethoscope for listening to the sound made by aerial blood flow. The parts of a Sphygmomanometer are as follows- Bladder, Cuff, Valve, Bulb and Manometer. To establish a service line at a healthcare meet and on admission to a hospital a Sphygmomanometer is used.