Please only do this with a safe or combination lock you own – we accept no liability for misuse. Using this technique you can detect when you hit a correct number and start dialing the other way. Turning the dial slowly, you can ‘hear’ when a tumbler drops in, because the spectrum of the sound will be very slightly different than turning one ‘normal’ tick (depending on the build quality of the safe or combination lock). As people age over 20 years, their aural perception range drops well below 21 kHzįor example, the app has been used to successfully find gas leaks and test ultrasonic pest control equipment.Īnother use case would be to help you get into a safe or combination lock for which you have forgotten the code: Use the spectrum analyzer with your device acoustically coupled to the safe’s dial – for mechanical tumblers only.
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Turn your phone into a Spectrum Analyzer.