There are ways you can spot skimmers on an ATM, as long as you're alert. If the ATM looks loose, or there are scratches or tape residue near the card slot this is a dead giveaway. If there is a pin size hole at the top of the ATM it's probably skimmer camera placed there. If you see this, contact the financial institution the machine belongs to. If you have any doubt about an ATM machine, don't use it.