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Turn a Calculator Into a Metal Detector : 6 Steps - Instructables
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How to Create a metal detector from household items « Hacks, Mods & Circuitry :: Gadget Hacks
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Dave Dellecese on X: "Just learned how to make a metal detector from a portable radio & calculator from Curious George. Thanks, @PBSKIDS! https://t.co/QVtMgitxsQ" / X
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