In fact, as far as ECG machines are concerned, the basic functions of various manufacturers are similar, and they all realize routine ECG examination. The above friend said that the failure rate and repair rate are a problem, but there are not many such events as ECG machines. In addition, it depends on his technical indicators and sampling rate, which determines the waveform effect. If the sampling rate, filtering and other technical indicators are not enough, it is likely to drown smaller waveforms such as P wave and T wave, and the clinical significance will be greatly reduced.
Don't be fooled by the salesman's words. It is important to see each product with your own eyes and see the effect with your own eyes before you draw a conclusion.