• "Out of paper": The tray is empty.
• "Ready": Some paper is left but the volume is uncertain.
• "Add paper": Remaining volume is uncertain but it is time to add paper.
• "--": Unable to determine whether there is any remaining paper.

• "Ready": The tray is still available for output but the capacity is unknown.
  

For toner:

• "n%" : n% toner is left.
• "OK": Sufficient but unknown level of toner is left.
• "Out of toner": The printer has run out of toner.
• "Replace Soon": The amount left is unknown but it is time to replace the toner.
  
• "--": Unable to determine whether there is any remaining toner.

For consumables other than toner:

• "n%" : n% of the consumable is left.
• "OK": Sufficient but unknown level of the consumable is left.
• "Replace Now": Empty
• "Replace Soon": The amount left is uncertain but it is time to replace the consumable.
  
• "--": Unable to determine the remaining level.