This device measures current incidence and daily dosage of ultra-violet radiation. Good for those with sensitive skin, those living at high-altitudes or mid-latitudes or those living under areas of ozone depletion, such as Australia, New Zealand and Tierra del Fuego. On 7 Sept 2003 the ozone hole reached populated land areas — residents of Punta Arenas, Chile, the world’s southern-most city, were advised not to go outdoors between 11 and 3.

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