Minelab Equinox 600 Waterproof Metal Detector - Rob's Detectors
Amazon.com : Fisher F22 Weatherproof Metal Detector with 9 Inch Weatherproof Coil, All-Purpose, High-Sensitivity, Deep Seeking Metal Detector, Pinpoint, Easy to Use : Patio, Lawn & Garden
Amazon.com : Fisher Gold Bug-2 Metal Detector with 10" Coil, 6.5" Coil by Fisher Labs : Hobbyist Metal Detectors : Patio, Lawn & Garden
How Do Metal Detectors Work? The Science of Magnetism and Metal