On the Quantify page, you are able to look at individual devices filtered by Event type. In the below screenshot, we are looking at Event type = High PER. We can see the first device in the table "Field-Test-9" has 1161 counts of this event over from July 20-August 20th.
You can filter by multiple attributes to add limits to your views. For example, if you're only interested in Netgear routers in Redwood City, you could filter for that in the Router and City column.
To drill down even further, click on the Device ID and it will take you to the Explorer page where you can examine that particular device.