Long exposure to ultraviolet light can damage your skin and eyes that may result in health problems, weaken your immune system, and cause skin cancer. It can be prevented with proper use of sunscreen and clothing coverage. The Microsoft Band 2 can help by letting you know the current UV index. It is the measurement of the intensity of the UV radiation from the sun on a scale of one to 11, with one being low risk and 11 being an extreme risk. How do you check the UV index on the Microsoft Band 2? We’ll show you.