Beware, skimmers are illegal card readers that can be attached to payment terminals — like gas pumps Use your eyes and fingers, they may be able to help you spot card skimmers at gas pumps and ATMs, but nothing is foolproof. Visually inspect the credit card system and card reader system. Before you slide your card in a fuel pump or ATM, take a good look at the gas pump credit card system. "Does anything look strange or out of place? Technology now allows criminals using a 3-D printer to create an overlay on top of the real credit card system. Look for broken security seals, pry marks on the pump door. Pull and wiggle on the credit card reader, If something doesn't feel right, move on. If you suspect something is wrong notify the attendant then notify the police.