Blood pressure is a very common measurement, but many people do not look at the sphygmomanometer when applying a mercury sphygmomanometer. Now a little about how to look at a mercury sphygmomanometer. The mercury sphygmomanometer requires a stethoscope to be used with the measurement, and since it requires another person to determine the systolic and diastolic readings, it feels like it is more complicated and requires two people to do it at the same time. First be sure to sit still for 15 minutes, keep one side of the sleeve, keep a thin garment, or reveal one side of the upper arm alone, put the cuff on the upper arm, not too tight or too loose, inflate the balloon, use the stethoscope to listen to the systolic and diastolic pressure during inflation, the first sound in the ring for systolic pressure, ring to the last sound disappears for 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.