Is it accurate to measure blood pressure with smart watch?

The smart watch is not accurate in measuring blood pressure. The electronic sphygmomanometer mainly judges the patient's blood pressure through the dial display, while the watch monitors the blood pressure through the optical sensor. This method will be interfered by movement, skin color, ambient light and other factors, which will affect the accuracy, so the smart watch is not accurate in measuring blood pressure. Smart watches are watches that have information processing capabilities and meet the basic technical requirements of watches. In addition to indicating the time, it has one or more functions such as reminding, navigation, calibration, monitoring and interaction, and its display mode can include pointers, numbers, images and so on. The adult smart watch has the functions of Bluetooth synchronous mobile phone call, sending and receiving short messages, monitoring sleep, sedentary reminder, recording running steps, remote photo taking, music playing, video recording, compass and so on.