Two twin scrolls that have been imbued with divination magic.
The two scrolls are attuned to each other; any writing upon one scroll will also appear on the other. A command word spoken by the bearer of either scroll erases the writing upon both pages and the contents of the scrolls cannot be viewed by a scry spell or other similar magic.
The connection between the two scrolls spans any distance, as long as both are on the same plane. Any damage sustained to one scroll is similarly sustained to the other.
Other that a faint magical aura, the scrolls otherwise appear to be completely ordinary parchment scrolls.