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WebMua sản phẩm Hilitand MD-5021 Underground Metal Detector, Waterproof, Metal Detector, Detects Iron, Aluminum, Bronze, Coins, Gold, Silver trên Amazon Nhật chính hãng 2024 Giaonhan247 Web28 mrt. 2012 · Metal Detector works by measuring the magnetic field around the location of your Android phone. It begins with a baseline measurement, then when it detects a metal, the measurement goes up and the ... sewing machine presser foot holder
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