Popularly owned by wealthy nonordained people, a Psalter was a religious book and can be otherwise known as the Book of Psalms. The purpose of the Psalter or The book of Psalms was a selection of scripture that was short enough to be used for reading and discussion as well as portable for a person to bring with them.
Princeton.edu. “Cataloging Biblical Materials.”Princeon.eduhttps://library.princeton.edu/departments/tsd/katmandu/bible/psalmpsalter.html
Cybulskie Daniele. “What is a Psalter?.”Medievalist.net,https://www.medievalists.net/2015/08/what-is-a-psalter