Blood pressure is a very common measurement, but many people do not look at the sphygmomanometer when applying a mercury sphygmomanometer. Now tell us how to look at the mercury sphygmomanometer. Mercury sphygmomanometer needs to be measured with a stethoscope, first be sure to sit still for 5-10 minutes, take off one side of the sleeve, or keep a thin garment, put the cuff on the upper arm, not too tight or too loose, stretch into a finger can be. Inflate the airbag, use the stethoscope to listen to the systolic and diastolic pressure while inflating, the first sound in the ring is the systolic pressure, and the last sound disappears is the diastolic pressure, this time you can read the systolic and diastolic pressure. However, when measuring, both eyes must be parallel to the mercury reading, so that no error can occur.