UV Meters

There is 3 type of UV (Ultraviolet) such as.
☀ UVA Light wavelength 315 to 400 nm found in natural sunlight can be through skin layer, if touched too much will be destroyed collagen tissue. Therefore, looks old over.
☀ UVB Light wavelength 280 to 315 nm found in natural sunlight can be through epidermis and upper skin, impact skin dried or burned. If touched too much can be skin cancer.
☀ UVC Light wavelength 100 to 280 nm short-wave, completely absorbed by ozone layer and atmosphere. UVC can be anti-virus. Now UVC light be produce for medical use and public health.