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This is a cool idea. It is a magic wand type thing that will sterilize water. It is $70 and would come in handy when you have a warning from the water company for your zip codes water quality. I have only had a few warnings in the last 10 years at my current location but even though they said not to drink the water for only a day or so, I was paranoid for weeks. I would have liked one of these. Especially during natural disasters like hurricanes, it is good to have because the water can get dirty. Just dip the SteriPEN in the water, turn it on, swirl it around, and let the UV rays do the hard work to protect you. It runs on AA batteries and is good for sterilizing up to 8,000 glasses of water.
Image Source: http://www.pcmag.com/slideshow/story/299150/equipment-for-high-tech-camping/9