WeatherAtPoint
World Smallest Weather Station
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Hunter's comment
Are you also a weather forecast junky just like me? Then you will love the smallest weather station you can carry around with you brought to by WeatherAtPoint. It plugs in directly into your smartphone and is powered by your device, which means that the weather station doesn't have any batteries which needs to get charged to work.
Once the key chain weather station is connected to your phone, fire up their app and get one of the most precise weather forecasts possible from the data you collected via the weather station.
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Hunter: 
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