Currency-counting machine

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A currency-counting machine is an electronic machine which counts stacks of money, usually banknotes but also sometimes coins. Some machines can also batch the money and some can even detect counterfeit bills either magnetically and/or using blacklight.

Such machines are now used in modern automated teller machines, allowing for cash deposits without envelopes, since they can also identify which bills have been inserted instead of just how many.

[edit] How it works

A stack of bills are placed in a compartment of the machine, and then one bill at the time is passed through the machine. By counting the number of times a bill is passed by a light (usually a laser), the machine can figure out how much money was placed in the compartment.