Many of us will have had occasion to go into Device Manager to troubleshoot connections to external hard drives, or update drivers for printers. Note that not everything connected to your PC may show up under the default settings in Device Manager.
Under View, you can select 'Show hidden devices' . . .
. . . to reveal everything that is connected to your computer. In this example, you can see that this setting shows imaging devices which are not shown under the default settings.