UV Monitoring KeyChain - Instablogs
UV Monitoring KeyChain
Veronica , Delhi: Jun 28 2006
Made Popular Jun 28 2006
If you don’t indulge quite often into outdoor sports just because you don’t want to expose yourself for a long time under the sun, then, all you need is a UV Monitor like this UV Monitor that comes wound-up in a keychain! The UV Monitor...
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1 Stars
These is really very useful device. The uv rays which causes skin cancer are uvb and uva, uvb light have wave length ranges from 280-315 nm and uva wave-length range 315-400 nm.

uvb is most dangerous as compare to uva.
Many people permanently used Sunscreen to block these rays. This thing not suitable for example a little quanity of uvb is neccessary for production of vitamin D in skin.
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