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Remote Sensing Using Lasers
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5000M 532nm Red Laser Pointer Star Visible Beam Light Lazer Pen+Battery&Charger | eBay
5000M Red Laser 532nm Pointer Star Visible Strong Beam Light Pen+Batter&Charger | eBay
Amazon.com: Danigh-buy Laser Pointer Pen[Material Upgrade], Long Range Red Laser Pointer High Power, Laser Toy for Night Astronomy Outdoor Camping Hunting and Hiking, USB Charge : Office Products
RX" High Power Red Laser Pointer - 200mW - 500mW
WISE Presentations -- Wavelength of Light -- May 2003