Tome of Identify (Diablo II)
A Tome of Identify is a burgundy book that can contain up to twenty Scrolls of Identify. The book is cheap and only takes up two inventory slots. It becomes fairly obselete once Deckard Cain is rescued, as he will Identify items for free.
The tome works similarly to the Tome of Town Portal, which holds Scrolls of Town Portal rather than Identify scrolls. If the tome is right clicked, an arrow will appear. Once an item is selected, it is identified and the Tome loses one scroll. If all the scrolls are used up, the the tome cannot be used again until it has more scrolls put in it.
The only way of obtaining a Tome of Identify, as well as the Tome of Town Portal, other than buying it from one of the Act towns' magic vendors, is from bookcases in the Jail and Catacombs levels in Act I.