Cash counting machines are made to count the number or denomination of bills that are placed into the machine. They pull in the bills, count the amount that was inserted, and give you the correct number of bills in a stack. This saves a lot of time and offers a mistake-free way to count large sums.  Cash counting machines are designed to count and sometimes sort bills. These machines have an internal beam that counts the number of times the beam of light is interrupted. This tells the machine how many bills have been counted. For machines that also help to detect counterfeit bills, there is a black light that illuminates the fluorescent images on real bills. This results in the ability to count the bills and detect counterfeit cash at the same time. There are also machines that can determine the denomination of each bill using colour image sensors, or CIS. The sensor scans and determines the value of the bill and adds this to the total on the display screen. Coin Counters, These machines do for coins what cash counting machines do for dollar bills. They count the number of coins that are put into the machine. However, there are also some models that can also sort the coins into different denominations by sorting the coin sizes separately. This will count the total number of coins and the amount of value between them all while sorting dimes quarters, nickels, and pennies into their own slots.