Is the heart rate belt exercise accurate?

Heart rate band can measure exercise heart rate accurately, but it must be professional, such as a suitable heart rate band, which can monitor the change of heart rate value in real time and give accurate feedback. The weight is also very light, and there is no sense of weight when worn on the body. You can connect various apps, and the data can also analyze the calorie consumption value. Can be worn in fitness, strength training, treadmill, yoga, fat-reducing exercise, running, cycling, mountaineering and other sports. I really recommend it.