According to Consumerist.com, here are some tell-tale signs to look for:
- Slots that don't fit (and can be removed!)
- Multiple mirrors - one could be hiding a camera that records your PIN
- Strange ATM error messages
- Trouble inserting or removing your card
- The ATM looks different from the other ATMs around it
- Dummy brochure boxes with hidden cameras on them
[Photo by ohad*]