mercury close-confinement sphygmomanometer

1. accuracy can reach to ±2mmHg
2. according to Korotkoff-Souna Method
3. auto air-releasing valve and no need the stethoscope
4.can detect the systolic pressure and diastolic pressure through the regular buzzing
5.have the purifier to purify the air
6.have the resistant leaking mercury bottle
7.AL body
8.have two choice:mimic channel or digit circuit
mercury close-confinement sphygmomanometer