When you select this item, the Dowsing Machine is held by the character in X & Y, or worn by the character in Omega Ruby & Alpha Sapphire, and will inform you when you are nearing an item. It will give off blue lights if you're pointed in the right direction, and go to red and make more noise as you get closer. In Omega Ruby & Alpha Sapphire, you cannot sneak while using this item.
It searches for hidden items in the area and emits different lights and sounds when it detects something.
This high-tech machine shows the location of invisible items. It's attached to the head when in use.