As the bill passes through the machine, a series of integrated sensors check one or more security features built into modern currencies.
The simplest devices just check for the presence of UV marks; more advanced ones add magnetic and size checks.
Top-of-the-line bill counters are programmed to specifically recognize the unique size, ultraviolet, infrared, magnetic and holographic properties of each denomination for every supported currency. (See our “Learn More About-How To Use” page if you’d like to know more about how counterfeit money detection works.)
