Forget stethoscopes and bolt cutters; this is the 21st century. This modern piece of safe-cracking equipment is simply a sensitive microphone, amplifier, and headset designed to work together to make Hollywood’s beloved by-ear safe crack a reality. Apparently, it includes some kind of noise cancellation, since the manufacturer claims you can “tune out distracting noises and hone in on the signals you are listening for,” and it’s sensitive enough to allow a skilled user to determine the type of mechanism he’s cracking.
It’s probably a bad idea to use this for anything other than its intended purpose. Odds are that the amplification is strong enough to blow out your eardrums with any noise beyond the usually-inaudible ticking of a lock mechanism. But if you need to get into a safe, this is one of few non-damaging methods. Lockmasters makes two versions: a $138 base model, and the pictured $315 Pro edition.