But the electronic sphygmomanometer needs to be calibrated annually
For the electronic sphygmomanometer, the electronic sphygmomanometer used by the medical institution needs to be calibrated annually, and there is a special metrology bureau, which calibrates the equipment annually, so that the electronic ssg does not have an expiration date, but needs to be calibrated regularly, but the civil Sphygmomanometers do not have this organization responsible for calibration