Which is better for measuring heart rate, Xiaomi bracelet 2 or apple watch?

"Apple Watch's heart rate sensor uses photoelectric plethysmography. This technology seems complicated, but the principle is simple: blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights and photosensitive sensors to detect blood flowing through the wrist at any time. When the heart beats, the blood flowing through the wrist will increase, and the absorbed green light will also increase; The interval between heartbeats will be shortened. The LED lights flash hundreds of times per second, and Apple Watch can calculate your heart rate per minute, which is your heart rate. "

So the principle of the two is the same, just don't know what's the difference between the equipment. Apples are so expensive, the testing instruments should be more accurate.

Comparison and summary of heart rate between mi band light-sensitive version and apple watch;

Well, after a simple experiment, to sum up:

The detection principles of the two devices are the same, the devices are similar, and the data obtained are basically the same;

Apple watch has a display screen, the data can be displayed intuitively, and it is convenient to read data continuously, but the standby time is too short, and it is necessary to charge at night, so there is no way to monitor sleep;

Mi band needs to read data by mobile phone, which is very troublesome, and only one data can be read at a time, but the standby time is long. If you turn on sleep heart rate monitoring at night, it will take about 20 days according to the power consumption;

At present, neither of them can be used well in the environment where heart rate monitoring is most needed, such as running and sports.