Review on Blood pressure monitor AND UA-777 with standard cuff and mains adapter by Boyan Kolev ᠌

I am a hypertensive patient with experience and I measure blood pressure all the time. A month ago I had to change the tonometer, the choice fell on this model. Tonometer is inaccurate! I have something to compare with, and I know and follow all the measurement rules. This tonometer in most cases significantly underestimates the readings. The device on which life depends can be so poor quality. Very sad. It is not subject to exchange, it is prohibited. The only solution is to contact the service center, which is problematic for me. And not every city has it.