Chances are good you've walked past a coin counting machine at some point. While they promise an easy way to count your spare change, can you really trust them?

It's supposed to make counting your loose change both convenient and easy, but an Action News investigation is calling into question the accuracy of some coin counting kiosks.

TD Bank's Penny Arcade coin counter has been a big hit with customers. Other companies feature coin counting machines, too.

The coin-counting machines you’ll find in grocery stores are often Coinstar kiosks. Here’s a list of some of the grocery stores that are known to have Coinstar machines.