What kind of monitor is more suitable for home use, such as parameters. . . There are old people at home.

General medical monitors can monitor ECG waveform, respiration, oxygen saturation, blood pressure, pulse and body temperature. The price is higher. I suggest you look at the physical condition of the elderly at home and choose which one to monitor. Generally, there are many blood pressure monitoring, so just buy a wrist sphygmomanometer, several hundred dollars. There is also a blood glucose meter, which is not expensive. A few hundred dollars can buy Johnson & Johnson. It is best to stay in hospital for observation if the condition is complicated.