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Published on Nov 24, 2010
Shows you how to use an ultrasonic thickness gauge to help determine whether a silver bar is real or not. It is one of the most accurate ways of determining if a bar is fake.
An ultrasonic thickness gauge measures how long it takes sound to travel through a material. Although lead and silver are very close in density, sound travels through them at very different rates (3,650m/s for silver versus 2,160m/s for lead).
By telling the UTG that we are measuing silver, it will show us how thick the bar should be if it is really made of silver. If that matches the real thickness, we have a real silver bar. Check the video to see how the results differ for the real silver bar and the fake one.