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At least some content in this article is derived from information featured in Fantastic Beasts and Where to Find Them (film). As such, spoilers will be present within the article.
|"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
This magical device was used in the United States of America that measured the threat level of exposure of magic to the No-Maj people. It hung in the central foyer of the Magical Congress of the United States of America.
It resembled a barometer, had four faces, and black hands. Various colours indicated the threat levels:
- Zero Threat (Green)
- Level One: Low Threat (Green)
- Level Two: Moderate Threat (Green)
- Level Three: High Alert (Blue)
- Level Four: Danger (Yellow)
- Level Five: Severe: Unexplained Activity (Orange)
- Level Six: Emergency (Red)
There were also counters indicating how many witch hunts have ocurred, how many times witches and wizards had been exposed, and how many times the Memory Charm had been used on non-magical persons.
If the wizarding community in America was close to exposure, the device sounded an alarm informing the Aurors of the impending threat.
Miniature versions that could be placed on a desk were also produced. Auror Percival Graves owned one of these. 
Behind the scenes
- The measurer appeared in the first film adaptation of Fantastic Beasts and Where to Find Them, and is digitally made.
- The measurer was made by Department for Magical Security.
- The design for the device was based on a sketch by MinaLima Design based on discussions with production designer Stuart Craig.
- The colour scheme was derived from Terror Alert levels used in the United States.
- It would seem the measurer was made before 1926 but neither earlier nor later than 1913, as The New York Ghost's 6 December 1926 issue has an article regarding threat levels from 1913 to 1926.