How do vending machines detect fake coins?
You must have noticed that the machine always spits the coin out if it's fake.
By : DC Correspondent
Update: 2016-05-05 06:10 GMT
Mumbai: Have you ever tried putting a wrong or a fake coin in a vending machine? You must have noticed that the machine always spits the coin out. Ever wondered how it detects if the coin is fake?
This is really interesting. Watch and learn: