A stethoscope, often considered the symbol of a doctor's profession, but also used by safe-crackers and auto mechanics to hear sounds that otherwise couldn't be heard. Well, it's time to make a high-tech electronic spy stethoscope with Kip Kay in this gadget video tutorial, for only twenty-five bucks! You can hear and record heartbeats with this spy gadget, or even listen through walls!
Materials needed: stethoscope, pair of multi-media microphones (for the mini condenser mics) drill, hot glue, mini-stereo Y-adapter, and a digital recorder or MP3 player/recorder.
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