Doradus DIY Metal Detector Kit Treasure Hunting Instrument Security Apparatus Stick

DIY Metal Detector Kit Treasure Hunting Instrument Security Apparatus Stick Feature: Supply voltage: 3-5V Dimensions: 66 x 61MM Maximum detection range: 5CM (Best detection range: 1 CM – 2 CM) Principle explanation: Q1, L1, L2, C2, C3, R1, W composed of high-frequency oscillation circuit,…

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Doradus DIY Metal Detector Kit Treasure Hunting Instrument Security Apparatus Stick

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