HQRP Color Charm / Keychain UV Radiation Meter / Tester for Skin and Eyes Health Monitoring / Solar Ultraviolet Radiation / Ultraviolet Sunlight Detection

The center of the Solar UV Meter with 3D effect can change series of color according to Solar UV Index. It is how Solar UV measuring function is maintained. The 4 standard color indicators show intensity of Solar UV rays. To know the Solar UV Index, it is enough to compare the colorchange with the 4 standard colors around. The greater intensivity is the darker is the color.Clear colors mean small intensity and dark colors mean great intensivity of Solar UV rays. Very light purple: low intensity, UV index 1-2. Sun-protection not necessary. Light purple: medium intensity, UV index 3-5. Sun-protection is recommended. Purple: strong intensity, UV index 6-7. Sun-protection is necessary. Dark purple: very strong intensity, UV index 8-11. Avoid exposure. Circle-shaped UV tester with keychain is convenient to use.