The centre of the Solar UV Metre with 3D effect can change series of colour according to Solar UV Index. It is how Solar UV measuring function is maintained. The 4 standard colour indicators show intensity of Solar UV rays. To know the Solar UV Index, it is enough to compare the colorchange with the 4 standard colours around. The greater intensivity is the darker is the colour.Clear colours mean small intensity and dark colours 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 chain is convenient to use.
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