Fairy Tracker

The Fairy Trackeris a device that detects fairies even in disguise.

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This radio-like device, allows the user to detect faries even in disguise. In the episode Transparents, it detected Cosmo and Wanda even in a human disguise. It features a solar-powered antenna and a small screen. It is used by Crocker in multiple episodes. This is one of Crocker's many fairy-detecting/capturing inventions.