How to measure UV rays on Apple Watch

Your iPhone doesn't pay attention directly to the UV index (although in hot sun, the iPhone can quickly see a temperature warning stating "iPhone needs to cool down" and feel very hot to the touch until It returns to the coolest position)

One is to align the UV detection hole of the watch with the sun, open the APP to test, the value will be displayed in the APP, the other is to align the UV detection hole with the sun, quickly double-click Press the 3H button and check the flashing status of the indicator light. Green light means weak ultraviolet light, yellow light means strong ultraviolet light, and red light means strong ultraviolet light.

Apple Watch contains many UV light sensors to detect whether the user is outdoors. Monitoring can also be enhanced with other sensors, including ambient light sensors and infrared light sensors.

These devices can provide more accurate data on the amount of light exposure a user receives and can also help determine whether the user is indoors or outdoors. Apple Watch can obtain location-specific UV index information from weather reports."