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X3 Fully Waterproof All Metal Detector Pulse Induction Underwater Ip68 Grade Handheld Portable Easy To Install Gold Sensor - Industrial Metal Detectors - AliExpress
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US 9,366,778 B1 - Pulse induction metal detector with quasi-resonant transmitter and associated method | RPX Insight
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Amazon.com : Metal Detector,Handheld 100 feet Waterproof Pulse Induction Metal Finder Targeting Pinpointer with PI Probe Pulse&LED Light Indicator ,for Underwater Metal Detecting Gold Digger Treasure Hunting : Patio, Lawn & Garden
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