Solder your own listening device that allows you to listening to the quietest sounds using the principles of a directional microphone.
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$13.10 $7.86
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$15.00 $9.00
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$66.00 $33.00
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$11.00 $9.00
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$11.00 $8.00
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$11.00 $6.00
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$48.00 $28.80
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$19.30 $11.58