How to Choose a Coffee Machine For Pods The pod machines read the barcode at the top of the pod (which is actually a disc of sealed, pre-dosed ground beans that are encased between two layers of filter paper). It is easy to insert it and then press a button. https://coffeee-uk17861.ziblogs.com/28407210/don-t-buy-into-these-trends-about-best-pod-coffee-machine