View guide prices is a button accessed from the Worn Equipment on the user interface. When pressed, players may select any tradable item in their inventory and view its current guide price, which is taken from the Grand Exchange. In addition, a player may remotely search an item's value in the bottom-left corner of the interface.
The feature proves useful in various situations, where players can conveniently check the prices of any items they seek or come across, and assists in gauging profits and losses. However, it is best to keep in mind that the guide price of an item may or may not accurately represent its true street value, and in some cases, can be very misleading.