- Not available on that edition (the reason is in the tooltip)
- Depends on the setting, your class or another addon (details in the tooltip)
What it does
Checks if you have the item you choose, or any item in the item set you choose, equipped.
Why you might use it
Check what you are wearing, so a step or a whole rotation follows your gear. Use it to suggest an on-use trinket such as Earthstrike only while it is actually in a slot, or as a switch condition that picks a different rotation while a particular shield or weapon is equipped. Item sets are checked in order and only the first item you carry or wear counts, not any item in the list. See also Have Item In Bags, Weapon Type and Item Set Pieces Equipped.
Example
you have Earthstrike equipped
Settings
What each setting in the condition editor means, from the game's own help.
Item Set - This is a list of items to look for in your inventory. This list is ordered, the top found item in the list that you are carrying or wearing is what will be used in this condition. NOTE: this will NOT search for ANY item in the list that matches this condition, only the first item found will be used in this condition.
You can choose from either a pre-defined Item Set, by picking it by name from the drop down menu. You can edit these using the Item Sets configuration menu. Any item set in cyan is a global item set available to all your characters, otherwise they are available to this character only. If you do not want to set up a reusable item set, you can select Custom to specify an ad-hoc item set.
Edit - Edit the contents of the item set. If you have selected a pre-defined item set, you will be editing that item set, which may affect other usages of that item set (including on your other characters if it is a global item set). An item set must have at least one item in it for this condition to be considered valid.
Item sets are checked in priority order. Bag counts use the first carried candidate, not the sum. Availability, range and cooldown checks use the first carried or equipped candidate. Missing or restricted observations stay unavailable, including under NOT.