A Secrecy Sensor is a device used to detect concealment and lies.

From the Story


A Secrecy Sensor is a Dark detector, and looks much like an extra-squiggly, golden television aerial. It vibrates when it detects concealment and lies.

Discovered in Harry Potter and the Goblet of Fire

The First Task, "Facing the Dragon"[1]

Professor Moody has a Secrecy Sensor in his office at Hogwarts. He tells Harry that it is no use within the school, as there is too much interference due to students lying about why they haven't done their homework and other fibs. The Sensor has been humming ever since Moody arrived at Hogwarts.


  1. Secrecy Sensor (as of Harry Potter and the Goblet of Fire, Chapter 20) on Pottermore

See Also

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.