PRTG Manual: Device Preview Form
The Device Preview form lets you view the devices that match a custom device filter you have created. This applies when you create or modify a custom device filter, or configure the settings on a dynamic device group. After modifying the settings on a filter, you can click the ‘Preview’ button to see which devices match the filter. The matching devices are displayed in the Device Preview form, which simply lists all of the matching devices, and displays the total number of matching devices at the top. For each matching device it displays the device’s name, IP address, and description.
