How is the sphygmomanometer calibrated, need detailed instructions! Thanks!

1. Mercury sphygmomanometer. Connect both the mercury and electronic sphygmomanometers with a three-way tube. See if the readings are similar.

2, such as electronic sphygmomanometer, return to the manufacturer with the manufacturer's machine for calibration

3, mercury sphygmomanometer needs to go to the relevant departments for mercury calibration every year.

No matter what sphygmomanometer can not be calibrated at home. The national standard is plus or minus 5 millimeters of mercury. Within this range is accurate.