ondevice:true
will show what books are on the device
that is currently connected to calibre.
See:
[GUI Plugin] Reading List to track that info automatically in a custom column.
Quote:
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You also have the ability to generate lists based on the content of your device. In combination with the ability to apply tags or populate a custom column based on membership in a list, this provides an easy way to keep track of books on your device(s) while they are not connected.
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