Winx Club Forever
It is a device that can enhance fairy magic to make imperceptible things visible.
The localizer is a small, purple gadget. It has a button on the left, that activates the machine when pushed. Its purple center has neon green lines inside it.
In "A Monster Crush", Tecna and the Winx arrived in Zenith, they ask Electronio on how they can make Cloud Tower visible again. Electronio then suggested they use the Spectrographic Localizer to make Cloud Tower visible again.